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“agglutinin”
A substance that causes clumping of the bacteria or other cells; agglutinating antibody: An agglutinin can be an antibody or a lectin, or something else that is able to effect an agglutination, like red blood cells or bacteria.
An agglutinin contains an immunologically similar, reactive antigen.
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agglutino-, aggluto-, agglutin- +
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