episome

Episome is an additional genetic element that can exist either as an autonomous entity or be inserted into the continuity of the chromosome of a host cell .

附加体是能插入寄生细胞连续的染色体之中，也能以自主实体而存在的一种附加遗传因素。

Episome & A DNA element that either can exist as an autonomously replicating sequence in the cytoplasm or can integrate into chromosomal DNA .

细菌染色体外的独立复制子，也可整合在宿主染色体中作为复制子的一部分的遗传单位。