Expressed by the venom duct. The cysteine framework is III (CC-C-C-CC). Classified in the M-2 branch, since 2 residues stand between the fourth and the fifth cysteine residues. Contains 3 disulfide bonds. The truncated conotoxin tx3e is only found with an hydroxyproline, whereas conotoxin tx3e is either hydroxylated or not hydroxylated. Belongs to the conotoxin M superfamily.