这个男孩经历了一次尤其剧烈的突变，他的第五条和第七条染色体各有一个片段互相交换了位置。
He had experienced a particularly dramatic mutation, in which a piece of chromosome 5 had been swapped with a piece of chromosome 7.
静脉采血检测染色体畸变、姊妹染色单体交换（ SCE）、细胞微核的发生率。
The mean frequencies of chromosome aberration (CA), sister chromatid exchange (SCE), and micronucleus(MN) were analysed.
目的与方法：单细胞凝胶电泳技术(SCGE)、姐妹染色单体交换法(SCE)和染色体畸变分析法均能被用来检测dna的损伤或修复。
Purpose and methods: Single cell gel electrophoresis (SCGE), sister chromatid exchanges (SCE), chromosome aberrations are three methods to determine DNA damage and repair.
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