Objective Cell-free DNA(cfDNA)in body fluids is extensively investigated in clinical medicine and the related areas,extr......

胎盘滋养层细胞具有凋亡细胞和胚胎的双重特性，其释放的游离DNA(cell free DNA，cfDNA)存在于孕妇的外周血中，其过程也受到母体因素的......