Methods: Chromosome analysis technique was used to observe SCE frequencies in cultured lymphocyte of control group, zinc sulphate group, penicillamine group and zinc sulphate+penicillamine group.

• 方法采用染色体分析技术对对照组、硫酸锌组、青霉胺组、(硫酸锌+青霉胺)组的姐妹染色单体互换(SCE)频率进行观察。