脱辅基酶蛋白：酶的辅助因子或辅基去除后（通过透析）剩下的没有催化活性的部分，是共轭酶的蛋白质部分。
Apoenzyme An ENZYME whose cofactor or prosthetic group has been removed (e. g. via dialysis) rendering it catalytically inactive. It is the protein part of a conjugate enzyme.
退化的胸腺细胞的胞质及部分质膜也显示酶活性。
The enzyme activity was demonstrated in the cytoplasm and on the plasma membrane of degenerated thymocytes.
结论：铅中毒所引起的部分血清酶活性逆向变化的机制是由于其活性受到铅等因素不同程度的抑制所致。
CONCLUSION: the mechanism of the reverse changes of enzyme activity in serum is due to the different degrees of activity inhibition by lead.
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