Lethal neurotoxin that blocks neuromuscular transmission. Acts cooperatively to potentiate the activity of huwentoxin-I. This toxin is active against insects. Heterodimer composed of the two variants Ile-58 and Gln-58. Expressed by the venom gland. Belongs to the neurotoxin 12 (Hwtx-2) family. 02 (Hwtx-2) subfamily.