Specific blocker of the voltage-dependent L-type calcium channel (Cav1/CACNA1) (PubMed:8826098). Inhibits cardiac contractions (By similarity). Expressed by the venom gland. LD(50) is 8 mg/kg by subcutaneous injection. Belongs to the snake three-finger toxin family. Short-chain subfamily. L-type calcium blocker sub-subfamily.