若断裂发生于染色体的两端，那么断裂下来的两个断片彼此可以粘合成一个，而带着丝粒的部分可通过两断端的粘合形成环状染色体。
目的探讨13号环状染色体综合征的进展。
Objective To explore the research progress of ring chromosome 13 syndrome.
目的通过对1例21号环状染色体综合征患者的细胞遗传学分析，探讨21号环状染色体的形成原因，临床表型与染色体区带的关系。
Objective to search the forming cause and the correlation between the clinical phenotype and chromosome band by the cytogenetic analysis on a case of ring chromosome 21 syndrome.
只需要多几次这类切除，就能达到带有单一环状线粒体祖先全部功能性基因的18条微型染色体。
It would take just a few more excision events to arrive at 18 mini chromosomes with all the functionality of their single-circle ancestor.
应用推荐