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In insects, proteolytic enzymes are involved in food digestion and the metamorphosis process. In the present study, the full-length cDNA of an aspartic proteinase, Spodoptera exigua cathepsin D (SeCatD), was cloned, and its functions in metamorphosis were characterized. SeCatD contains an open reading frame of 1152 nucleotides, encoding a 384-amino acid polypeptide including a signal peptide and two...
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