Sepia is a variety of this 3-letter defensive secretion produced by cephalopods
The funnel organ is the second gland contributing to the ink 
secretion,... [DOC] [TLE] A peroxidase related to the mammalian antimicrobial protein ... [PAR] Nov 26, 1996 ... An antibody made against a fragment of LO4 immunoprecipitated dianisidine 
peroxidase .... Peroxidase Activity in Various Squid Tissues.