– Beta toxins bind voltage-independently at site-4 of sodium channels (Nav) and shift the voltage of activation toward more negative potentials thereby affecting sodium channel activation and promoting spontaneous and repetitive firing. This toxin is active against both mammals and insects. Tb2-II Protein, Tityus bahiensis, Recombinant (E. coli, His & Myc) is expressed in E. coli expression system with N-10xHis and C-Myc tag. The predicted molecular weight is 12.0 kDa and the accession number is P60276.