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皮肤粘膜色素脱失引起白癜、白斑和白化症,其色素脱失是由于哪一物质缺乏所致( )

单选题
2021-07-17 22:42
A、酪氨酸酶
B、酪氨酸
C、苯丙氨酸
D、二经苯丙氨酸
E、氨基酿
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正确答案
A

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