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Effect of catechin and its derivatives on the inhibition of polyphenoloxidase from the cephalothorax of Pacific white shrimp. Bars represent the standard deviation (n = 3). Different letters on the bars indicate significant differences (P < 0.05). C catechin, EC epicatechin, ECG epicatechin gallate, EGC epigallocatechin, EGCG epigallocatechin gallate
