Has potent antimicrobial activity against Gram-positive and Gram-negative bacteria (in vitro). May play a role in the innate immune response. Detected in bursa of Fabricius, in filamentous structures surrounding the basal and lateral surfaces of bursal M cells (at protein level). Detected in bursa of Fabricius, in secretory enterocytes of the interfollicular bursal epithelium, but not in M cells. Belongs to the cathelicidin family.