[Noninvasive screening for trisomy 21].
Samia
S
Hurst
D004247:DNA / Q000097:blood; D004314:Down Syndrome / Q000175:diagnosis* / Q000235:genetics; D005260:Female; D006801:Humans; D011247:Pregnancy; D011296:Prenatal Diagnosis / Q000379:methods*
D004247:DNA