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。
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In addition, the phenomenon of fatigue retardation was explained through the viewpoint of energy based on the concept of new parameter.