Has antibacterial activity against the Gram-positive bacterium M.luteus with an IC(90) of 125ug/ml. Has weak antibacterial activity against the Gram-negative bacterium A.hydrophila. Expressed in the ejaculatory ducts of mature males. Not detected in the ejaculatory ducts of immature males. Not detected in hepatopancreas, female reproductive tract, eyes, exoskeleton, subcuticular epithelia, heart, gills, stomach, muscle and hemocytes.