Methods The DNA samples of 19 parent child pairs with mutations in three loci (FGA, D12S391, and D11S554) were genotyped by silver staining on STR. Alleles to be sequenced were excised from gels, reamplified by PCR, and purified.

• 方法用银染方法对 3个 STR位点 (FGA、D12 S391、D11S5 5 4 )共 19个发生突变的家系父、母、子的 DNA样本进行 STR基因分型 ,将需测序的等位基因条带从凝胶上切下 ,再进行 PCR扩增 ,产物经纯化作为测序模板 ,采用循环测序法测序。