Abstract

ERYTHROCYTE antibodies were first demonstrated by their ability to agglutinate erythrocytes suspended in saline; these have been termed complete antibodies. In 1944, Wiener1 and Race2 independently showed that certain erythrocyte antibodies were incomplete, possessing the ability to fix to the erythrocyte surface without leading to agglutination. It has been postulated1, and generally accepted, that the complete saline agglutination antibody is bivalent, and the incomplete coating antibody univalent. Recent investigations in our laboratory using antibodies labelled with iodine-131 have led us to question this hypothesis3,4. Our results could best be explained by assuming a bivalent nature of incomplete erythrocyte antibodies.

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