骨钙素
骨钙素是1|25(OH)2D3刺激下由成骨细胞合成的非胶原蛋白。血清骨钙素水平基本上能够反映近期成骨细胞合成骨钙素和骨形成的情况。
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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