CAP18 (rabbit) is a 37 amino acids antimicrobial peptide originally isolated from rabbit granulocytes. CAP18 (rabbit) has broad antimicrobial activity against both Gram-positive ( IC 50 , 130-200 nM) and Gram-negative ( IC 50 , 20-100 nM) bacteria. CAP18 (rabbit) has the potential for bacterial sepsis research.