cecropin B protein, Insecta [ P9B protein, Hyalophora cecropia,P9B protein, Insecta,cecropin B protein, Hyalophora cecropia ] from cecropia moth, Hyalophora cecropia; small basic protein; has potent antibacterial activity against E coli & other Gram-negative bacteria; also found in a variety of other insects; structure given