This report describes a female ease who is complete deletion of secondary constriction on two chromosomes 9. The major clinical phenomenon is severe mental retardation.
本文报道了一例两条9号染色体次缢痕缺失的女性病例，临床表现为严重智力低下和语言障碍。
It is presumed that the repeated DNA sequences of the heterochromatin near the secondary constriction might be formed gradually in the process of evolution through unequal SCEs.
推测副缢痕附近异染色质的DNA重复序列可能是在进化过程中通过染色单体不均等交换而逐渐形成。
The secondary constriction has been observed on the centromere region of the chromosome No.
染色体短臂近着丝粒区观察到次缢痕。
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