Letter: International units and standards in immunology.
D000486:Allergy and Immunology / Q000592:standards*; D006801:Humans; D007136:Immunoglobulins / Q000032:analysis; D014894:Weights and Measures; D000509:alpha-Fetoproteins / Q000032:analysis
D007136:Immunoglobulins; D000509:alpha-Fetoproteins