Its target is unknown, but this toxin may modulate voltage-activated calcium channels (Cav) or calcium-dependent potassium channels (KCa). Expressed by the venom duct. The cysteine framework is C-C. Exists in two forms, due to cis-trans isomerization at 4-Cys-hydroxyPro-5. The cis conformation is the major form. Belongs to the O2 superfamily. Contryphan family.