The result shows that EI fragmentation process of cholesterol esters is determined mostly by the steroid nucleus, and there is almost no difference among the mass spectra of various compounds.

结果表明：胆甾醇酯的EI质谱裂解途径主要由甾环决定，各化合物谱图之间几乎无差别；

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Many steroid hormones act because they bind to cellulars - to receptors that are deep within the cell, often inside the nucleus.

许多类固醇激素能够起效是因为,其与存在于细胞内部的受体相结合,这类受体通常在细胞核内

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