09639 IUPAC Gold Book - blood group 10.1351/goldbook.09639 09639 current 1 Red cell phenotypes classified by their antigenic structural characteristics, which are under the control of various allelic genes. The cell membrane properties that provide the specific antigenicity of the blood groups are called agglutinogens, as they agglutinate or clump in the presence of their specific antibody. O, A, B PAC, 2018, 90, 1121. 'Terminology of bioanalytical methods (IUPAC Recommendations 2018)' on page 1124 (https://doi.org/10.1515/pac-2016-1120) https://goldbook.iupac.org/terms/view/09639/html https://goldbook.iupac.org/terms/view/09639/json https://goldbook.iupac.org/terms/view/09639/plain Citation: 'blood group' in IUPAC Compendium of Chemical Terminology, 5th ed. International Union of Pure and Applied Chemistry; 2025. Online version 5.0.0, 2025. 10.1351/goldbook.09639 The IUPAC Gold Book is licensed under Creative Commons Attribution-ShareAlike CC BY-SA 4.0 International (https://creativecommons.org/licenses/by-sa/4.0/) for individual terms. If you are interested in licensing the Gold Book for commercial use, please contact the IUPAC Executive Director at executivedirector@iupac.org . The International Union of Pure and Applied Chemistry (IUPAC) is continuously reviewing and, where needed, updating terms in the Compendium of Chemical Terminology (the IUPAC Gold Book). Users of these terms are encouraged to include the version of a term with its use and to check regularly for updates to term definitions that you are using. 2026-08-01T19:21:07+00:00