Abstract
At least nine monoclonal antibodies against phytochrome from Pisum sativum L. and 20 against phytochrome from Avena sativa L. have been obtained from mouse hybridomas that were produced by fusion of spleen cells with SP 2/O-Ag14 myeloma cells. Hybridomas were selected and cloned in a single step by plating on a semisolid methylcellulose medium. Eight antibodies to Pisum and one to Avena phytochrome were immunopurified from hybridoma medium or ascitic fluid. When necessary, secreted antibodies were verified to be against phytochrome by demonstrating to be against phytochrome by demonstrating immunoadsorption of phytochrome, detected as loss of photoactivity and-or by appearance of the approx. 120,000-dalton phytochrome band upon sodium dodecyl sulfate polyacrylamide gel electrophoresis.
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