title: Report of the committee on the genetic constitution of chromosomes 20, 21, and 22.
mesh_terms: D002874:Chromosome Mapping; D002890:Chromosomes, Human, Pair 20; D002891:Chromosomes, Human, Pair 21; D002892:Chromosomes, Human, Pair 22; D008040:Genetic Linkage; D005819:Genetic Markers; D006801:Humans
chemical_list: D005819:Genetic Markers