Expressed by the venom duct. The cysteine framework is III (CC-C-C-CC). Classified in the M-1 branch, since 1 residue stands between the fourth and the fifth cysteine residues. The precursor sequence of reg3l described in Franco et al., 2017 corresponds to the precursor of conotoxin reg12l (AC A0A2I6EDL5). Belongs to the conotoxin M superfamily.