This specific blocker of the L-type calcium channel (Cav1/CACNA1) is a smooth muscle relaxant and an inhibitor of cardiac contractions. Expressed by the venom gland. The sensitivity is higher in cells of the cardiovascular system. Neuronal, and insulinoma cells L-type calcium channel are more resistant. A total resistance is found in skeletal muscle cells. Belongs to the snake three-finger toxin family. Short-chain subfamily. L-type calcium blocker sub-subfamily.