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      "statement": "# Blood groups: explaining why some transfusions are incompatible\n\nLandsteiner distinguished patterns of blood agglutination between people, helping explain why blood from different donors cannot always be mixed safely. The work established a foundation for blood-group compatibility testing.\n\n## Scientific scope\n\nThe 1901 contribution did not include every later blood group, the full modern ABO nomenclature or all safeguards of transfusion medicine. Later discoveries and clinical implementation require their own attribution.\n\n## Reading status\n\nThis is a source-linked WRS catalogue note. A full explanatory guide and independent scientific reconstruction have not been completed for this entry. Read the identified original work for its complete narrative and arguments.\n\n## People and systems\n\nKarl Landsteiner\n\nNamed source contributors; broader team, precursor or trial-group roster remains incomplete.\n\n\n\n## Original sources\n\n- [Landsteiner: Individual differences in human blood — Nobel lecture](https://www.nobelprize.org/uploads/2018/06/landsteiner-lecture.pdf)\n- [Nobel archive: Landsteiner biography](https://www.nobelprize.org/prizes/medicine/1930/landsteiner/biographical/)\n",
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