Highly inhibits both nicotinic acetylcholine receptors (neuronal (alpha-3/beta-4) and neuromuscular (alpha-1/beta-1/epsilon/delta) subtypes) and the voltage-gated potassium channel Kv1.6/KCNA6 subtype. Expressed by the venom duct. The cysteine framework is XIV (C-C-C-C). Belongs to the conotoxin J superfamily.