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.
在HBV感染肝细胞以后，环状病毒基因组进入细胞核，并停留其中不受宿主细胞染色体的影响。
After infecting liver cells, the circular HBV genome travels to the cell nucleus, where it is remains, as a circle, independent from the cell chromosomes.
结果：经太空诱变后的生物工程细胞染色体畸变率为：环状占10.5%，无着丝断片占36.75%，三射、四射体占13%。
Result: The abnormal chromosome rate of bio-engineering cells muted by outer space were: ring chromosome, 10.5%; acenericfragment, 36.75%; triceneric and fourcentric, 13%.
结果：经太空诱变后的生物工程细胞染色体畸变率为：环状占10.5%，无着丝断片占36.75%，三射、四射体占13%。
Result: The abnormal chromosome rate of bio-engineering cells muted by outer space were: ring chromosome, 10.5%; acenericfragment, 36.75%; triceneric and fourcentric, 13%.
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