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【单选题】
下列关于降钙素的描述中不正确的是
A.
来自甲状腺滤泡旁(c)细胞
B.
由32个氨基酸残基组成
C.
其分泌的主要调节因素是血钙浓度
D.
血钙升高会反馈抑制甲状腺滤泡旁细胞合成降钙素
E.
降钙素的主要生理功能在于降低血钙和血磷水平
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