IQ and ABO blood groups.
D000017:ABO Blood-Group System; D000293:Adolescent; D000328:Adult; D000368:Aged; D004739:England; D005260:Female; D005787:Gene Frequency; D008040:Genetic Linkage; D005828:Genetics, Population; D006801:Humans; D007360:Intelligence; D008297:Male; D008875:Middle Aged; D010641:Phenotype
D000017:ABO Blood-Group System