title: [Types and counter-types].
mesh_terms: D000782:Aneuploidy; D002869:Chromosome Aberrations; D025063:Chromosome Disorders; D002901:Chromosomes, Human, 13-15; D002902:Chromosomes, Human, 16-18; D004314:Down Syndrome; D006801:Humans; D008967:Molecular Biology; D014314:Trisomy
vernacular_title: Types et contretypes.