title: When does maternal age-dependent trisomy 21 arise relative to meiosis?
authors.forename: C J
authors.initials: CJ
authors.lastname: Zheng
authors.forename: B
authors.initials: B
authors.lastname: Byers
mesh_terms: D000328:Adult; D004314:Down Syndrome / Q000235:genetics*; D005260:Female; D005819:Genetic Markers; D006579:Heterozygote; D006720:Homozygote; D006801:Humans; D008297:Male; D008423:Maternal Age; D008540:Meiosis / Q000235:genetics*; D011247:Pregnancy
chemical_list: D005819:Genetic Markers