Acute phase protein with antibacterial activity against the Gram-negative bacteria E.coli (MIC=6.25 ug/ml) and S.sonnei (MIC=12.5 ug/ml). Lacks antibacterial activity against the Gram-negative bacteria P.vulgaris, P.rettgeri and P.aeruginosa, and against the Gram-positive bacteria B.subtilis, S.aureus, M.luteus, B.megaterium, C.bovis and E.cloacae. Synthesized by the fat body and secreted into the hemolymph. By injury to the body wall of the larva. Expression peaks at 10 hours post-injury and is maintained at this level for at least 3 days. On the 2D-gel the determined MW is: 8 kDa. Belongs to the attacin/sarcotoxin-2 family.