Selection of "safe" group O blood.
D000017:ABO Blood-Group System; D000372:Agglutination Tests; D001789:Blood Group Antigens; D006460:Hemolysin Proteins; D006801:Humans; D066298:In Vitro Techniques; D008403:Mass Screening
D000017:ABO Blood-Group System; D001789:Blood Group Antigens; D006460:Hemolysin Proteins