It may be the mutagenic material. In chapter 3, to study the effect of heroin on the activity of rRNA genes in NOR. The NOR and acrocentric association were studied in 30 male drug addicts and 30 normal men by the method of Ag-NOR.

• 第三章中，为了研究毒品对男性核仁组织区(NOR)的rRNA基因活性的影响，采用银染核仁组织区(Ag-NOR)技术，分别对30名男性吸毒患者和30名正常男性的NOR及近端着丝粒染色体联合(Ag-AA)进行了初步研究。