Alpha-conotoxins act on postsynaptic membranes, they bind to the nicotinic acetylcholine receptors (nAChR) and thus inhibit them. This toxin selectively binds to the fetal (alpha-1/beta-1/gamma/delta subunits) mammalian muscle nicotinic acetylcholine receptors (nAChR). It blocks the elicited currents completely and dissociates very slowly from the fetal muscle receptor. Expressed by the venom duct. The cysteine framework is IV (CC-C-C-C-C). Contains 3 disulfide bonds (By similarity). They are not added, since framework IV presents two different connectivities (I-V, II-III, IV-VI and I-III, II-V, IV-VI). Belongs to the conotoxin A superfamily.