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An anti-peroxidase-anti-biotin hybrid hybridoma rat cell line, capable of producing a bispecific monoclonal antibody, has been derived to explore its use in conjunction with a luminol immunodetection system. Luminescence was detected using x-ray film. The method was sufficiently sensitive and effective, but was less sensitive than autoradiographic methods using high-specific-activity 32P-labeled probes. Exposure times, on the other hand, were of the order of seconds rather than days. The direct binding of both peroxidase and biotin by the bispecific monoclonal antibody is simpler but less sensitive than the more conventional indirect method using a commercial peroxidase coupled with anti-rat antibody as a developing antibody.

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