Potential neurotoxin. No target has been identified for this peptide. Expressed by the venom duct. The cysteine framework is XVI (C-C-CC). Pc16a is the amidated form, whereas Pc16b is the non-amidated form. monoisotopic, amidated form. monoisotopic, non-amidated form. The native peptide has no effect on nicotinic acetylcholine receptor (nAChR) subtypes human alpha-4-beta-2/CHRNA4-CHRNB2 and chicken alpha-7/CHRNA7. The synthetic peptide has no effect on a wide range of mammalian and insect voltage-gated sodium channels and voltage-gated potassium channels (PubMed:22079220).