centromeric sequence (CEN 序列)
是真核生物在有丝分裂和减数分裂时,两个染色体附着的区域,含有11个高度保守的碱基序列,功能是形成着丝粒,均等分配两个子代染色单体。
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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