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Lysozymes are key proteins to invertebrates in the innate immune responses against bacterial infections. A lysozyme gene isolated from tiger shrimp, Penaeus monodon, was cloned, sequenced and characterized. The cDNA consists of a signal peptide of 18 amino acids and a mature peptide of 140 amino acids. The lysozyme is presumed to be a chicken-type lysozyme for it possesses two catalytic sites and...