CJCP     2009 11 (10):  862-865    ISSN: 1008-8830  CN: 43-1301/R Progress in the research on cell-free fetal DNA in maternal plasma ZOU Xin, DU Juan, LU Guang-Xiu. Insitute of Reproductive and Stem Cell Engineering, Central South University, Changsha 410078, China Received: null  Revised: null  Online: null Supporting info