Has no antimicrobial activity (PubMed:11784303). Inhibits the formation of NO by neuronal nitric oxide synthase (nNOS) at micromolar concentrations (PubMed:11784303). Acts by a non-competitive mechanism, probably by binding to calcium/calmodulin and as a consequence blocking calmodulin attachment to nNOS (PubMed:11784303). In vitro, does not exhibit cytotoxicity towards 60 human tumor lines (PubMed:11784303). Expressed by the skin glands. Belongs to the frog skin active peptide (FSAP) family.