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生物学 八聚体 The octamer formation in vivo is related to cell growth process. During the log-phase of cell growth, the specific activity of nitrogenase is increasing, and the tetramer is the major form of molybdenum-iron protein. 在细胞生长过程中,胞内钼铁蛋白两种聚合体的相对含量出现规律性变化:在对数期,细胞固氮酶比活力成上升趋势,而钼铁蛋白主要以高活力的四聚体形式存在;在对数期结束至稳定期,细胞固氮酶比活力下降至一个低水平的稳定值,此时的钼铁蛋白基本上为八聚体形态。 八聚合体
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