2Hahn S, Holzgreve W. Fetal cells and cell-free fetal DNA in maternal[J]. Human Reproductive Update, 2002, 8(6) :501-508.
3Lo YMD, Corbetta N, Chamberlain PF, et al. Presence of fetal DNA in Maternal plasma and serum [J]. Lancet, 1997, 350 :485-487.
4Bianchi DW, Zickwolf GK, Well GJ , et al. Male fetal progenitor cell persist in maternal blood for as long as 27 years postpartum[J]. Proc Natl Acad Sci (USA) , 1996 , 93:7052705.
5Bartha JL , Finning K , SoothiU PW. Fetal sex determination from maternal blood at 6 weeks of gestation when at risk for 21-hydroxylase deficiency [J]. Obstetrics Gynecology, 2003, 101(5) : 1135-1135.
6Ao A, Frickson RP, Winston R, et al. Transcription of paternal Y linked genes in the human zygote as early as the prenudeate stage [J]. Zygote, 1994, 2(4) :281.
7Reynolds R, Varlaro J. Gender determination of forensic samples using PCR amplification of ZFY/ZFX gene sequence[J]. J Forensic Sci, 1996, 41(2) :279.
8Sambrook J, Fritsch EF, Maniaatis T(eds). Molecular cloning, A Laboratory Manua[M] . 2nd ed, New York, Cold Spring Harbor Laboratory, 1989: 50.
9Murray V. Improved double- stranded DNA sequencing using the linear polymerase chain reaction[J]. Nucl Acids Res, 1989, 17(12):8889.
10Chen Q, Neville C, Mackenzie A, et al. DNA sequencing with requiring no DNA template purofication[J ]. Biotechniques, 1996, 21(3) :453.