Alpha-conotoxins bind to the nicotinic acetylcholine receptors (nAChR) and inhibit them. This synthetic peptide (10 uM) selectively, but weakly inhibits both rat neuronal alpha-3-beta-2/CHRNA3-CHRNB2 (63%) and alpha-3-beta-4/CHRNA3-CHRNB4 (37%) subtypes of nAChR. Expressed by the venom duct. The cysteine framework is I (CC-C-C). Alpha4/4 pattern. Belongs to the conotoxin A superfamily.