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[L. agglutinare, to glue to + -in]
An antibody present in the blood that attaches to an antigen present on cells or solid particles. The antibody causes the cells or particles to agglutinate. Agglutinins cause transfusion reactions when blood from a different group is given. These antibodies are present at birth and require no exposure to an antigen to be created since they are genetically determined.

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