Bacteriostatic action for Gram-positive bacteria (PubMed:10504394). Strongly 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). Expressed by the dorsal and submental skin glands.