Conotoxin with small effects on sodium (Nav), potassium (Kv) and calcium (Cav) currents. At high concentration (10 uM), it has no effects on the peak sodium currents, but induces a ~10 mV shift in a polarizing direction in the current-voltage relationship. At the same concentration, it increases 19% of the peak potassium currents but does not induce a shift in the current-voltage relationship. At the same concentration, it inhibits 31% of the peak calcium currents but does not induce a shift in the current-voltage relationship. On rat DRG neurons, it inhibits calcium channel currents with an IC(50)=19.28 uM. Moreover, at 10 uM, it inhibits 15.32% of the human Cav1.2/CACNA1C currents and 12.86% of the human Cav2.2/CACNA1B currents. Expressed by the venom duct. The cysteine framework is III (CC-C-C-CC). Classified in the M-4 branch, since 4 residues stand between the fourth and the fifth cysteine residues. Belongs to the conotoxin M superfamily.