Highly inhibits both nicotinic acetylcholine receptors (neuronal (IC(50)=8.7 uM for alpha-3/beta-4) and neuromuscular (IC(50)=0.54 uM for alpha-1/beta-1/epsilon/delta) subtypes) and the voltage-gated potassium channel Kv1.6/KCNA6 subtype (IC(50)=1.59 uM). Expressed by the venom duct. The cysteine framework is XIV (C-C-C-C). No or very small inhibition is observed on Kv1.1/KCNA1, Kv1.2/KCNA2, Kv1.3/KCNA3, Kv1.4/KCNA4, Kv1.5/KCNA5 and Nav1.2/SCN2A. Belongs to the conotoxin J superfamily.