The alignment of the primary sequence of BtITx3 shows 50–60% homology with the short insect toxins based on which the three-dimensional structure of I5A (1SIS) was taken as the template to build the model structure of the desired toxin. BtITx3 was modeled with the template structure of the Mesobuthus eupeus toxin (I5A) [35] previously determined by nuclear magnetic resonance (NMR) (1SIS), showing one α-helix from Asn11 to Asp18 and a β-sheet consisting of three β-strands, one from Met3 to Cys5, the second from Lys25 to Phe27 and the third from Pro29 to Leu32 ( Fig. 4). The final modeled structure also has one α-helix from Asn11 to Lys18 and a β-sheet consisting of three β-strands, one of them from Pro3 to Cys5, the second from Tyr25 to Ala27 and the last one from Tyr29 to Ile32. The quality of the model for BtITx3 was assessed using the program WHAT IF, which showed that the model was as good as that of the homologous toxin structure 1SIS, implying good stereochemical quality. The PROCHECK report shows that the model has a Ramachandran score of 75.5, which is close to that of the template 76.9. Other stereochemical properties are also in agreement with that of the template, which indicates that the model structure of BtITx3 shows a similar scaffold as possessed by the other short insectotoxins blocking the chloride channel.