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34 kDa and HlyA secretion signal peptide alone. We also confirmed melittin expression using an anti-melittin bleed, which bound to melittin conjugated to HlyA secretion signal. 29 kDa as well as to synthetic melittin. 3 kDa Additional file 3 Figure S3a. a Western blot showing secretion and accumulation of melittin and SLM conjugated to HlyA secretion signal by transformed P. agglomerans lines in spent media. Spent media from transformed P.

agglomerans lines were concentrated using Micron 10 kDa filters. Concentrated spent medium was tested using an anti-E-tag antibody. Lane 1 ladder; lane 2 Wild type P. agglomerans ; lane 3 HlyA secretion signal only; lane 4 melittin conjugated to HlyA secretion signal; lane 5 SLM conjugated to HlyA secretion signal. bc Western blots showing secretion and accumulation of melittin and SLM conjugated to HlyA secretion signal by transformed P. agglomerans lines in the GWSS gut.

Extracts from homogenized GWSSs were tested for presence of AMPs using an anti-E-tag antibody. b Lane 1 ladder; lane 2 GWSS fed on P. agglomerans expressing melittin conjugated to HlyA secretion signal; lane 3 GWSS fed on wild type P. agglomerans c Lane 1 ladder; lane 2 GWSS fed on P. agglomerans expressing SLM; lane 3 GWSS fed on wild type P.

Five insects were tested individually for accumulation of SLM and melittin, and two insects were found positive for presence of both AMPs. Blocking transmission of X. fastidiosa from H. Results from two independent experiments were pooled after confirming that the experiments did not affect the outcome using a generalized linear mixed model.

GWSS that harbored AMP-producing P. agglomerans were refractory to X. fastidiosa acquisition; insects that carried melittin- or SLM-secreting P. agglomeranson an average, had X. fastidiosa burden that was 4. 2respectively, of the pathogen burden in control insects p Fig. Graphs showing a decrease in X. fastidiosa acquisition by paratransgenic GWSSs. agglomerans was painted on grape stems after mixing with guar gum.

PA WT - wild type P. agglomerans ; PA HlyA - P. agglomerans expressing HlyA secretion signal only; PA Melittin - P. agglomerans expressing melittin conjugated to HlyA; PA SLM - P. agglomerans expressing SLM conjugated to HlyA. The GWSSs were allowed to feed on Pantoea -painted plants for 48 h before putting them in a cage containing X. fastidiosa- infected plants for 48 h. Subsequently the GWSSs were collected and two GWSSs were caged per single naive grape plant for 24 h.

These GWSSs were surface sterilized and X. fastidiosa presence was assayed using rt-PCR. fastidiosa CFUs per insect head; b Percent of GWSSs carrying X. These are pooled results from two independent experiments. The paratransgenic GWSS that acquired melittin- and SLM- producing P. fastidiosafailed to transmit X. fastidiosa to the naïve grape plants, indicating decreased acquisition of X. fastidiosa by H. agglomerans strains prior to acquisition of X. vitripennis resulted in decreased pathogen transmission to naïve grape plants Fig.

Control GWSS and GWSS carrying wild type P. agglomerans transmitted X. fastidiosa 16. 7 and 20 of the time, respectively. GWSS that carried P. agglomerans, which secreted only the HlyA signal protein and not the AMP molecules also failed to transmit X. fastidiosa to the naïve plants. Decrease in X. fastidiosa transmission to grape plants by paratransgenic GWSSs. agglomerans were painted on grape stems after mixing with guar gum.

The GWSSs were allowed to acquire P. agglomerans from P. agglomerans -painted plants for 48 h before an acquisition access period of 48 h on X. fastidiosa -infected grape plants. Subsequently the GWSSs were collected and two GWSSs were then confined per naive grape plant. After 24 h of inoculation access, the insects were removed and the plants were kept in a greenhouse for 30 weeks before testing them for presence of X.

fastidiosa using rt-PCR. GWSSs that acquired P. agglomerans expressing HlyA secretion signal, melittin conjugated to HlyA secretion signal and SLM conjugated to HlyA secretion signal did not transmit X. Expression of AMP within H. GWSS that fed on AMP-expressing P. agglomerans were tested for presence of recombinant AMP molecules to confirm that decrease in Xylella transmission to grapevines was a result of AMP activity in the insect gut.

Western blot analysis confirmed presence of both melittin and SLM with attached HlyA secretion signals within the insects Fig. Further, we confirmed presence of melittin using anti-melittin serum Additional file 3 Figure S3b. Prior studies with paratransgenic insect vectors demonstrated reduction or elimination of pathogens in the insects 6, 9. Here, we report a paratransgenic strategy that completely eliminates the detectable transmission of a pathogen from an arthropod to a target plant.

Three molecules- the HlyA protein, melittin and SLM- when expressed in the GWSS via engineered P. agglomeransblocked transmission of X. fastidiosa to grape plants. Melittin and SLM decreased Xylella CFUs in paratransgenic GWSS to levels that should eliminate pathogen transmission even during periods of feeding that exceed the 24 h window used in our experimental model. Additionally, under field conditions, several GWSS may feed on a single plant, unlike our experimental model in which only 2 insects were placed on target plants.

Again, the level of elimination of X. fastidiosa in the insect achieved with melittin and SLM should block transmission under such real world conditions. HlyA alone did reduce X. fastidiosa acquisition by the GWSS and eliminated transmission in our study. Similar results were also observed by Wang et al. 9 in paratransgenic mosquitoes, wherein they observed a 32 decrease in Plasmodium prevalence in mosquitoes carrying HlyA secretion signal-expressing P.

agglomeransthough this reduction was not significant statistically. We believe that the impact of HlyA on X. fastidiosa may be more pronounced than the effect on Plasmodia due to greater susceptibility of the bacterial cell membrane. However, the degree of X. fastidiosa reduction in the insect that is due to HlyA alone may not prevent transmission of the pathogen under conditions of prolonged feeding under field settings.

Almeida and Purcell 21 reported transmission efficiency of 35. 3 after 96 h of acquisition and inoculation access using a model 1 iq option a single GWSS per plant. However, we used two insects per plant with an acquisition and inoculation access of 48 h and 24 h, respectively, and a transmission of 20 was observed in the control group.

Future studies will require varying acquisition and inoculation access times and increased number of insects per plant to simulate vector pressure under field conditions to understand the overall impact of transformed bacteria on acquisition and inoculation efficiency of the insect. Our lab has also developed single chain antibodies scFvs specific to the X. fastidiosa surface protein, mopB 22. These antibodies can be expressed in tandem with active AMPs or as antibody AMP chimeras to increase killing efficacy and further reduce target resistance.

We are also working on developing antibodies targeting different membrane proteins and pili present on the surface of X. A theoretical concern exists for evolution of resistance amongst target X. fastidiosa populations. These antibodies in combination with other AMPs may slow resistance development. In our experiments, 10 10 CFU of P.

agglomerans were painted on each plant. This is, indeed, a high concentration of bacteria but one that was readily administered using a hand-painted approach. In future applications, different bacterial concentrations need to be tested to determine the threshold CFU required to break transmission cycles. Antibody-AMP chimeras are known to increase the potency of effector molecules 23 and, perhaps, can be used to make the insect incompetent of acquiring the pathogen at lower CFU s.

Field collected GWSS have been reported to carry different bacteria within their foregut other than X. fastidiosa 24,25,26 and to our knowledge no adverse effect of these colonizing bacteria on insect health has been reported. For instance, P. agglomerans expressing EGFP was able to colonize the GWSS gut without impacting the insect s health 15.

We also did not 1 iq option adverse physiological effects in the GWSS carrying P. agglomerans strains, such as decreased feeding or early mortality. This suggests that paratransgenic GWSS could be able to complete their life cycle without a negative selection pressure from recombinant symbiotic bacteria. We anticipate that this will allow persistence of recombinant bacteria and, possibly, spread amongst field populations of GWSS.

The balance between persistence of recombinant bacteria, spread within a GWSS population and need for repeated applications of engineered symbionts can be addressed in additional field studies. The full potential of the paratransgenic control method under field conditions has not yet been realized, largely due to lack of delivery strategies that target arthropods.

We have recently developed a strategy based on calcium-alginate microparticles to disseminate genetically modified bacteria in the field. These microparticles not only provide a physical barrier between the bacteria and the outer environment to decrease environmental contamination, but also provide protection against desiccation and UV radiation 15. Spread of pathogens that cause Pierce s disease and other vector-borne diseases depends largely on the control of arthropod populations with insecticides.

There are reports of development of resistance in many insect vectors including mosquitoes and triatomine bugs against insecticides 27,28,29,30. Paratransgenic control of these diseases is an alternative, which can be employed in the field to decrease transmission. It can also be included in integrated vector management. The high bacterial concentrations in this study were intended as proof-of-concept. Paratransgenic control may help to reduce spread of human and plant diseases and may decrease over-reliance on chemical pesticides.

The paratransgenic model for PD control may write a new chapter in the control of diseases caused by pathogens carried by agricultural vectors. 1 iq option, aphids, leafhoppers and thrips transmit deadly pathogens to crop plants ranging from cotton to sugarcane to papaya to rice 31,32,33,34,35,36. These insects carry bacterial symbionts that enhance their fitness. Future directions of paratransgenic control for agricultural diseases may employ these symbionts as Trojan Horses to block transmission of pathogens.

Furthermore, we report the first potential agricultural application of paratransgenic control and are confident that transgenic symbiotic bacteria can be used individually or as a component of integrated vector management to protect crops from threats such as Pierce s disease. The glassy-winged sharpshooters GWSS maintenance. The Glassy-Winged Sharpshooters H. We report, for the first time, protection of a target from a vector-borne disease, using paratransgenic control.

vitripennis were collected from crepe myrtle, Lagerstroemia sp. trees planted in parking lot 9 of UC, Riverside. These GWSS were kept on basil plants until they were used. A laboratory-based method for propagation of GWSS is not yet available, necessitating use of field-caught arthropods. Bacterial strains, culture conditions.

Escherichia coli strain XL1-Blue was used to maintain plasmids and for gene cloning. Pantoea agglomerans E325, an EPA approved biological control agent, was used to express and deliver different AMP molecules inside the GWSS gut. agglomerans were grown in Luria Bertani agar or broth. agglomerans and E.

coli were cultured on agar plates at 30 C and at 37 C, respectively. Broth cultures were grown at the same temperatures in a shaker incubator 200 rpm. Carbenicillin or chloramphenicol was added at a concentration of 100 μg mL and 35 μg mL, respectively, when needed. Two plasmids that were used in study pEHLYA2-SD and pVDL9.

3 have carbenicillin or chloramphenicol resistance markers, respectively. fastidiosa Temecula strain was used in this study and was cultured in PD3 agar at 28 C or in PD3 broth at 28 C. The culture was agitated at 175 200 rpm to grow X. fastidiosa in broth culture. Plant inoculations. fastidiosa strain Temecula was grown in PD3 medium using the conditions as described previously. The bacteria were harvested in log phase and washed thrice with PBS before resuspending in PBS and brought to an O.

25, which is an equivalent of 10 8 cells ml. Twenty μL of bacterial suspension was inoculated twice into the vine using a needle. The stem was pricked above the second leaf using the needle and one drop of X. fastidiosa suspension 2X10 6 was placed on the point of inoculation; the negative pressure of xylem internalized the bacterial suspension.

The plants were kept for 15 weeks before they were used. MIC and MBC of AMPs against P. agglomerans was grown in LB broth at 200 rpm in a shaker incubator at 30 C for 16 h. Afterwards P. agglomerans was diluted 1 100 in 3 mL LB broth and grown at 30 C to mid-log phase. At mid-log phase the bacteria were diluted in LB medium to 10 5 10 6 colony forming units mL CFUs mL. Ninety μL of diluted P. agglomerans were pipetted into sterilized 0.

2 mL PCR tubes and to this 10 μL of 10X test concentration of either melittin or SLM both synthesized by China Peptides, Shanghai, China was added. These tubes were incubated at 30 C and after 16 h of incubation OD 600 was determined to ascertain MIC minimum inhibitory concentration of AMPs against P. fastidiosa strain Temecula was grown in PD3 medium in a shaker incubator at 28 C and 200 rpm until it reached its log phase. Afterwards the X. fastidiosa culture was diluted to a concentration of 10 5 10 6 CFUs mL in PD3 medium.

Ninety μL of diluted X. fastidiosa were mixed with 10 μL of 10X test concentration either AMP in a sterilized 0. 2 mL PCR tube and was incubated at 28 C in a shaker incubator for 16 h. fastidiosa is a slow growing bacterium, which makes measuring change in OD 600 of overnight cultures unfeasible. Hence, after treatment with AMPs X. fastidiosa was plated on to PD3 agar to determine MBC minimum bactericidal concentration of AMPs against X.

These plates were incubated at 28 C for 10 days and CFUs were counted. The toxicity assays were repeated twice with three replicates for each dose in each experiment. Plasmid construction. Sense and antisense sequences of the melittin gene with NheI and XmaI overhang were ordered from IDT Coralville, Iowa, USA and were annealed to themselves by lowering the temperature by 1 C min from 95 C to 50 C. Possani using forward primer ScoHlyAF1. Scorpine like molecule SLMan AMP from Vaejovis mexicanus venomgene was amplified from a plasmid kindly provided by Dr.

1 CAGCTAGCGGTTGGATAAGCGAG; and reverse Primer ScoHlyAR1. The product was cut using restriction enzymes NheI and SmaI. 1 TTTTTTATAGGCACGGGGTATACC. The plasmid pEHLYA2-SD kindly provided by Dr. Fernandez, National Center for Biotechnology, Madrid, Spain - having the hlyA secretion signal of the E. coli hemolysin secretion system and bla β-lactamase gene as marker- was also cut using restriction enzymes NheI and SmaI. Melittin or SLM genes were ligated into linearized pEHLYA2-SD plasmid Additional file 2 Figure S2.

The in-frame presence of both melittin and SLM genes was confirmed by sequencing. The in frame insertion of melittin or SLM gene resulted in plasmid pEHLYA2-SD-Mel or pEHLYA2-SD-SLM. agglomerans transformation. agglomerans was cultured in LB broth and grown to an OD600 of 0. 7 mid-log phase. These cells were centrifuged at 4 C and 8000 rpm for 10 mins and supernatant was removed. The cells were washed with ice cold autoclaved water.

The final cell pellet of competent cells was re-suspended in 1 mL 10 glycerol. Eighty μL of competent cell suspension were aliquoted into microcentrifuge tubes. One μL of 1 iq option. 3 chloramphenicol resistance as marker plasmid was added to 80 μL of competent cells and transferred to an ice cold 1 mm cuvette. These cells were electroporated at 2. 0 kV, 25 microF.

The cells were then plated onto chloramphenicol-containing LB agar. Sixteen hours after plating the colonies were selected and presence of plasmid was confirmed. 3 plasmid-containing P. agglomerans cells were made competent using the above mentioned protocol and were transformed with plasmid pEHLYA2-SD or pEHLYA2-SD-Mel or pEHLYA2-SD-SLM.

agglomerans containing both the plasmids were selected on LB agar containing carbenicillin and chloramphenicol. Anti-melittin bleed production and ELISA. Once the bleeds were received the ELISA was conducted on dilutions of melittin ranging from 30 nM to 10 μM. Hundred μL of each dilution was pipetted into the wells of 96-well plate in triplicate. The plate was sealed using plastic wrap and incubated at 37 C for 2 h.

After the incubation the wells were washed 3 times with 250 μL TBST tween 20 tris-buffered 1 iq option. After washing, the wells were filled with 250 μL of 2. 5 BSA bovine serum albumin -TBST and sealed. After 2 h of incubation at room temperature the wells were washed three times with 250 μL TBST before adding 100 μL of anti-melittin bleed 1 5000 dilution in TBST in each well and sealed.

The plate was incubated at room temperature for 2 h. Afterwards the plate was washed with 250 μL TBST 3 times and 250 μL of secondary antibody goat-anti rabbit,1 5000 dilution in TBST was added, sealed and covered with aluminum foil. The plate was incubated for 1 h at room temperature. After incubation the plate was washed three times with 250 μL TBST and 100 μL of TMB 3,3 ,5,5 -Tetramethylbenzidine was added and covered with aluminum foil.

After 30 min of incubation at room temperature the reaction was stopped by adding 100 μL of 18 M H2SO4 per well and the plate was read at 450 nm. The lowest detection limit of the bleed was 1 μM Additional file 4 Figure S4. Detection of melittin and SLM in spent medium. The supernatant from each culture was concentrated using 10 kDa NMWL filter EMD Millpore, Temecula, CA, USA.

agglomerans grown in LB for 16 h was centrifuged at 10000 rpm and the supernatants were collected. Twenty μL of concentrated spent medium was mixed with 5 μL of loading dye and run on a 8 16 precast polyacrylamide gel Biorad, Hercules, Califirnia, USA at a constant electric 1 iq option of 150 V. The proteins were then transferred to a nitrocellulose membrane. The nitrocellulose membrane was first incubated with primary rabbit anti-E-tag antibody Abcam, Cambridge, MAwhich was diluted to 1 1000 in 10 milk-TBST, at room temperature.

This membrane was washed 5 times with TBST and was developed using NBT nitro blue tetrazolium and BCIP 5-bromo-4-chloro-3-indolyl-phosphate. This membrane was washed 5 times with TBST and incubated with mouse anti-rabbit antibody with AP alkaline phosphatase conjugate, which was diluted in milk-TBST to 1 5000. Presence of melittin in the supernatant was reconfirmed using rabbit anti-melittin bleed using the protocol as mentioned above. Anti-melittin bleeds were generated by injecting five rabbits with synthetic melittin and subsequently testing activity of bleeds harvested from these rabbits against melittin via ELISA.

fastidiosa transmission blocking assays. agglomerans lines were cultured in LB broth for 16 h and cultures were washed twice with PBS. After washing, 10 10 CFUs of P. agglomerans lines were suspended in 3 mL PBS. Each suspension was mixed with 20 mL 3 guar gum w v. One mL glycerol and 500 μL India Ink were added to it before this slurry was painted on to grape stems cv Chardoney.

These plants were then covered with sleeve cages and field collected GWSS were released on these plants. The plants were kept overnight to let the guar gum dry. The sharpshooters were kept on these plants for 48 h before putting them on X. fastidiosa -infected plants for another 48 h. After acquisition access of 48 h on X. fastidiosa -infected plants, the GWSS were collected and two of these GWSS were confined on naive grape plants for 24 h. The insects were removed after 24 h, surface sterilized and DNA was extracted before running real-time PCR.

The inoculated grape plants were kept in the greenhouse for 30 weeks and were tested for X. fastidiosa infection via real-time PCR. The experiments were conducted according to the institute guidelines. The experiment was repeated independently and the results were pooled together. DNA extraction from the insect head. The GWSS were surface sterilized by washing in 70 ethanol for 2 mins followed by in 10 bleach for 2 mins and rinsed twice in sterilized water for 2 mins.

The heads were removed from the sterilized GWSS using a surgical blade. The GWSS heads were then homogenized in 200 μL PBS using a Kontes homogenizer and DNA was extracted using DNeasy Blood and Tissue Kit Qiagen, Valencia, CA, USA following manufacturer s instructions. DNA extraction from plant tissues. After 30 weeks of inoculation, stems of 10 cm were cut from the plants. These stems were sterilized by washing in 70 ethanol and 10 bleach for 2 mins each, followed by 2X washing in sterilized water for 2 mins.

These stems were put in Adagia bags Elkhart, IN, USA and homogenized in 800 μL of lytic buffer 20 mM Tris-Cl pH 8. 0, 70 mM sodium EDTA, 2 mM sodium chloride, 20 mM sodium metabisulfite using mortar and pestle. Two hundred μL of plant tissue suspension in lytic buffer was placed in a 1. 5 mL microcentrifuge tube. Each suspension was incubated at 55 C for 1 h after adding 40 μL of 5 sodium sarkosyl and 1.

5 μL of proteinase K. After 1 h of incubation this suspension was centrifuged at 13000 rpm for 15 mins and supernatant was collected. DNA was purified from the supernatant using a GeneClean kit MP Biomedicals, Santa Ana, CA, USA following manufacturer s instructions. Real-time PCR. We used ITS-specific primers and probes described in Schaad et al. 37 to run real time-PCR. The 20 μL reaction was performed in 0.

1 mL strip tubes containing 10 μL 2X IQ Supermix Biorad, Hercules, CA100 nM forward primer, 200 nM reverse primer, 200 nM Taqman probe with dye, 5. 8 μL of PCR-grade water and 2 μL of template DNA. The real-time PCR was performed on the Eppendorf Realplex at 95 C for 3 mins for enzyme activation followed by denaturation at 95 C for 15 s, and extension and annealing at 62 C for 1 min. The PCR was run for 40 cycles.

Detecting accumulation of AMPs inside the insect body. The Glassy-Winged Sharpshooters were surface sterilized as mentioned above. The whole GWSS were then homogenized in PBS using a Kontes homogenizer. Twenty μL of supernatant was mixed with 5 μL of reducing marker and was run on precast Mini PROTEAN TGX gels Biorad, Hercules, Califirnia, USA.

Proteins were transferred on to nitrocellulose membranes as mentioned above and accumulation of protein was detected using primary rabbit anti-E-tag antibody as mentioned above. The homogenized solution was then centrifuged at 13,000 rpm for 10 mins and supernatant was used for AMP detection. Accumulation of melittin inside the insect body was confirmed using rabbit anti-melittin serum.

The protocol for Western blot is mentioned above. Chi-square tests for homogeneity were employed to compare number of GWSS carrying X. fastidiosa in their foreguts. fastidiosa CFUs present in GWSS foregut in various treatments were analyzed by Tukey s test for multiple comparisons after taking log values of CFUs. All values are shown as mean S. Statistical analyses were performed using Minitab version 17 for windows8.

Clony forming units. Minimum bactericidal concentration. Minimum inhibitory concentration. Schorderet-Weber S, Noack S, Selzer PM, Kaminsky R. Blocking transmission of vector borne diseases. Int J Parasitol Drugs and Drug Resist. Martini X, Willett DS, Kuhns AH, Stelinski LL. Disruption of vector host preference with plant volatiles may reduce spread of insect-transmitted plant pathogens.

National Academies of Sciences, Engineering, and Medicine. Global Health Impacts of Vector-Borne Diseases Workshop Summary. Washington, DC The National Academies Press; 2016. Perilla-Henao LM, Casteel CL. Vector-borne bacterial plant pathogens interactions withHemipteran insects and plants. Front Plant Sci. Chuche J, Auricau-Bouvery N, Danet JL, Thiéry D.

Use the insiders could insect facultative symbionts control vector-borne plant diseases. Durvasula RV, Gumbs A, Panackal A, Kruglov O, Aksoy S, Merrifield BR, Richard FF. Beard CB prevention of insect-borne disease an approach using transgenic symbiotic bacteria. Proc Natl Acad Sci U S A. Aksoy S, Weiss B, Attardo G. Paratransgenesis applied for control of tsetse transmitted sleeping sickness. In Aksoy S, editor. Transgenesis and the management of vector-borne disease. New York Springer; 2008.

Hurwitz I, Hillesland H, Fieck A, Das P, Durvasula R. The paratransgenic sand fly a platform for control of Leishmania transmission. Parasit Vectors. Wang S, Ghosh AK, Bongio N, Stebbings KA, Lampe DJ, Jacobs-Lorena M. Fighting malaria with engineered symbiotic bacteria from vector mosquitoes. Paradigms examples from the bacterium Xylella fastidiosa. Annu Rev Phytopathol. Saponari M, Loconsole G, Cornara D, Yokomi RK, Stradis AD, Boscia D, Bosco D, Martelli GP, Krugner R, Porcelli F.

Infectivity and transmission of Xylella fastidiosa by Philaenus spumarius Hemiptera Aphrophoridae in ApuliaItaly. J Econ Entomol. Food security Italy s olives under siege. Cornara D, Saponari M, Zeilinger AR, de Stradis A, Boscia D, Loconsole G, Bosco D, Martelli GP, Almeida RPP, Porcelli F. Spittlebugs as vectors of Xylella fastidiosa in olive orchards in Italy. Redak RA, Purcell AH, Lopes JRS, Blua MJ, Mizel RF III, Andersen PC.

The biology of xylem fluid-feeding insect vectors of Xylella fastidiosa and their relation to disease epidemiology. Annu Rev Entomol. Arora AK, Forshaw A, Miller TA, Durvasula R. A delivery system for field application of paratransgenic control. BMC Biotechnol. Bee venom in cancer therapy. Cancer and Metastasis Rev. Quintero-Hernández V, Ramírez-Carreto S, Romero-Guitiérrez MT, Valdez-Velázquez LL, Becerril B, Possani LD, Ortiz E.

Transcriptome analysis of scorpion species belonging to the Vaejovis genus. Roy A, Kucukural A, Zhang Y.

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