The acid phosphatase group system of erythrocytes in the diagnosis of zygosity of twins.
D000135:Acid Phosphatase / Q000097:blood*; D001789:Blood Group Antigens; D004912:Erythrocytes / Q000201:enzymology*; D005260:Female; D006720:Homozygote; D006801:Humans; D010641:Phenotype; D011247:Pregnancy; D014427:Twins
D001789:Blood Group Antigens; D000135:Acid Phosphatase