The rate of chromosomal aberration in the workers working in grass root hospitals(0.421%) was higher than those working in upper level hospitals(0.083%).
基层医院放射工作者染色体畸变率（0.421%）明显高于上级医院（0.083%）。
Objective:To observe the expression level of CENP-I gene in human trophoblast cells with numerical chromosomal aberration.
目的：探讨人胚胎滋养层细胞中染色体数目异常与着丝粒特异性蛋白质CENP-I表达水平的相关性。
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