Familial occurrence of increased activity of blood-group A in serum.
D000017:ABO Blood-Group System; D000293:Adolescent; D000755:Anemia, Sickle Cell / Q000235:genetics; D044383:Black People; D002648:Child; D005260:Female; D006385:Hemagglutination Inhibition Tests; D006455:Hemoglobins, Abnormal / Q000032:analysis; D006801:Humans; D007519:Isoantigens / Q000032:analysis*; D037102:Lectins / Q000494:pharmacology; D008297:Male; D008875:Middle Aged; D012463:Saliva / Q000276:immunology
D000017:ABO Blood-Group System; D006455:Hemoglobins, Abnormal; D007519:Isoantigens; D037102:Lectins