Methods The DNA templates were extracted by plasma DNA extraction from gravida(conceived -0 weeks) plasma. SRY gene and four short tandem repeats(STRs)(DS,DS,DS,DS) of fetal DNA were detected by polymerase chain reaction(PCR).
Methods The DNA templates were extracted by plasma DNA extraction from gravida(conceived -0 weeks) plasma. SRY gene and four short tandem repeats(STRs)(DS,DS,DS,DS) of fetal DNA were detected by polymerase chain reaction(PCR).
方法应用血浆DNA抽提法提取 例孕7~0周妇女血浆中胎儿DNA,运用PCR扩增技术对SRY基因和个短串联重复序列(STR)多态位点(DS、DS、DS、DS)进行检测。