Blocks both the muscle-twitch response to nerve stimulation and the response to exogenous acetylcholine. Expressed by the venom gland. In contrast to other snake toxins the action of this toxin is reversible. Unusual amino acid sequence distinctly different from other short-chain type toxins. Is classified as a P-type cytotoxin, since a proline residue stands at position 30 (Pro-31 in standard classification). Belongs to the snake three-finger toxin family. Short-chain subfamily. Orphan group XVIII sub-subfamily.