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Inhibition by cystamine on TGase activity in vitro. A, inhibition of commercial TGase from guinea pig liver by different concentrations of cystamine. B, inhibition of TGase activity from HPT lysate. Each symbol represents an individual crayfish. The columns represent the mean from four to six crayfish, and the error bar represents the S.D. value. *, p < 0.05, **, p < 0.01, and ***, p < 0.001 indicate a significant difference compared with the control.
