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Lineaweaver–Burk plots of polyphenoloxidase from cephalothorax of Pacific white shrimp in the absence and presence of catechin (a), epicatechin (b), epicatechin gallate (c), epigallocatechin (d) and epigallocatechin gallate (e) at different concentrations. L-DOPA at levels of 0.5–5 mM were used as substrate
