A nucleic acid sequence encoding a polypeptide having antibacterial activity, which nucleic acid sequence has the nucleotide sequence of Bases 198 to 452 of Seq. ID No. 13 or is a nucleic acid that hybridizes under highly stringent conditions to a complement of a nucleic acid having the nucleotide sequence of Bases 198 to 452 of Seq. ID No. 13, and the polypeptide encoded thereby.