Does not show activity on all the human nAChR subtypes studied. Expressed by the venom duct. The cysteine framework is I (CC-C-C). Alpha4/8 pattern. Both the globular (with C1-C3; C2-C4 disulfide pattern) and ribbon (C1-C4; C2-C3) isomers shows no activity on muscle-type alpha-1-beta-1-delta-epsilon/CHRNA1-CHRNB1-CHRND-CHRNE nAChRs, alpha-3-beta-2/CHRNA3-CHRNB2, alpha-3-beta-4/CHRNA3-CHRNB4, alpha-4-beta-2/CHRNA4-CHRNB2, alpha-7/CHRNA7, and alpha-9-alpha-10/CHRNA9-CHRNA10. Belongs to the conotoxin A superfamily.