The association of group G chromosomes : study in trisomy 21 syndrome and their mothers in comparison to normal women of various ages.
D000328:Adult; D002904:Chromosomes, Human, 21-22 and Y; D004314:Down Syndrome / Q000175:diagnosis / Q000235:genetics*; D005260:Female; D006801:Humans; D008677:Metaphase; D011247:Pregnancy; D011296:Prenatal Diagnosis