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【单选题】
关于血红素合成错误的叙述是下列哪项?
A.
ALA 合酶是血红素合成的限速酶
B.
ALA 脱水酶是血红素合成的限速酶
C.
主要在骨髓的幼红细胞和网织红细胞合成
D.
血红素对其合成的关键酶有反馈抑制作用
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