Pre-RC (前复制复合物)
主要包括Orc(origin recongnition complex)、cdc6、cdc45和Mcm蛋白,Pre-RC结合到复制起点,,使G1期染色体处于“感受”状态,是DNA复制起始所必需的。
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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