Antimicrobial peptide active against many Gram-negative enterobacterial and plant-associated bacterial species. Not active against other bacterial species like H.pylori, P.mirabilis, B.pertussis or N.gonorrhoeae. Not active against Y.enterolytica or A.tumefaciens. Among others, also active against Y.enterolytica and A.tumefaciens. By bacterial infection. Apidaecin Yj +S. Apidaecin Yj - S. Belongs to the apidaecin family.