"centruroides suffusus suffusus" is a mexican scorpion from the genus "centruroides" belonging to the family "buthidae". "c. suffusus suffusus" has at least seven different β-toxins, of which cssii is considered the major toxin in the venom affecting mammals. the single gene for cssii has been identified, and cloned using "e. coli", resulting in recombinant cssii.