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Residual phytase activities of PhyC-R and PhyC-N preparations after shrimp digestive enzyme (Hp) treatment (a) and after porcine trypsin treatment (b). The data are the means ± the standard deviations of at least three independent assays. *, P < 0.05 (differences for the effect of the protease treatment concentration on each phytase). **, P < 0.05 (differences between PhyC-R and PhyC-N at the same protease treatment concentration).
