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Activity staining of polyphenoloxidase of DEAE-Sepharose fraction from cephalothorax of Pacific white shrimp in the absence and presence of catechin or its derivatives at a concentration of 2 mM. M molecular weight marker, A DEAE-Sepharose fraction, C catechin, EC epicatechin, ECG epicatechin gallate, EGC epigallocatechin, EGCG epigallocatechin gallate
