Antibacterial peptide mostly active against Gram-positive bacteria with atypical up-regulation of expression. Basal levels of expression during all life stages, with higher levels during larval development peaking at larval instars 2/3. Not induced in 4th instar larvae following a blood meal, an infected blood meal, sterile injection or bacterial injection (E.coli K12 RM148 and M.luteus). Belongs to the invertebrate defensin family.