这个词是什么意思？
An exchange of segments between the sister chromatids of a chromosome, either between the sister chromatids of a meiotic tetrad or between the sister chromatids of a duplicated somatic chromosome. Its frequency is increased by ultraviolet and ionizing radiation and other mutagenic agents and is particularly high in BLOOM SYNDROME.
中文名称索引；定义为 MeSH 英文原文，尚未逐条译审。MESH:D012854 · MeSH 2026。
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