Methods The loss of heterozygosity (LOH)of YNZ22, APC, MCC and DCC genes was examined by PCR RFLP technique in 60 IM cases.

• 方法 应用PCR?RFLP法检测了60 例肠化生组织中YNZ22、APC 、MCC、DCC基因杂合性缺失现象。