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Univalent antibody fragments were isolated from a papain-digested antiserum to human chorionic gonadotrophin. The univalent antibody fragments were purified, iodinated with ¹²⁵I and used in a sensitive immunoradiometric assay of human luteinizing hormone. Unlike intact divalent antibodies, the univalent radioactive antibody fragments cannot simultaneously bind to both soluble antigen and antigen-immunoadsorbent.