This family consists of the pleurocidin family of antimicrobial peptides. Pleurocidins are found in the skin mucous secretions of the winter flounder (Pleuronectes americanus) and these peptides exhibit antimicrobial activity against Escherichia coli. Pleurocidin is predicted to assume an amphipathic alpha-helical conformation similar to other linear antimicrobial peptides and may play a role in innate host defense [1].

1: Isolation and characterization of pleurocidin, an antimicrobial peptide in the skin secretions of winter flounder. Cole AM, Weis P, Diamond G; J Biol Chem 1997;272:12008-12013. PMID:9115266