2.红细胞内依赖性维生素B6酶活性的测定红细胞内需要PLP酶，如谷丙酮酸转氨酶（EGPT）、谷草酰乙酸转氨酶（EGOT）、天门冬氨酸转氨酶（α-EAST）等，也是评价体内维生素B<sub>6<sub>营养状况的敏感指标。
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