Coral peptide that probably acts as an antimicrobial peptide in the surface mucous layer of planula larvae and likely also in adults. Shows moderate to high activity against some Gram-negative and Gram-positive bacteria (tested on E.coli, B.megaterium, S.aureus, E.aesturaii, B.algicola, Acinetobacter spec.). Does not show antibacterial activity against the coral pathogen V.coralliilyticus. Shows more potent antibacterial activity at pH 6.2 (approximate coral mucus pH) than at pH 8.0 (approximate pH of seawater). Expressed at late stages of coral development (late planula, polyps, and adults), in ectodermal cells. Belongs to the coral AMP family.