Methods:The repeat numbers of CTG, ENG and NCV of MD gene were determined by PCR amplification and DNA hybridization in 5 cases of MD (clinically diagnosed) and 16 members from there families (three families).

• 方法：用聚合酶链反应（PCR）扩增及DNA杂交法对5例临床诊断DM患者及三个家系的16名成员进行DM基因的CTG重复数和EMG、NCV测定。