title: A note on the heritability of memory span.
mesh_terms: D000293:Adolescent; D002648:Child; D004777:Environment; D005260:Female; D005823:Genetics; D005838:Genotype; D006801:Humans; D008297:Male; D008568:Memory; D011247:Pregnancy; D014429:Twins, Dizygotic; D014430:Twins, Monozygotic