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Production and characterization of antibodies directed against the human melatonin receptors Mel-1a (mt1) and Mel-1b (MT2).

We report the production of polyclonal antibodies directed against the human melatonin receptors Mel-1a (mt1) and Mel-1b (MT2) by means of antigenic synthetic peptides with sequences unique to these proteins. Immunostaining on NIH3T3 cells stably transfected with Mel-1a and Mel-1b cDNA gave intense reactions. Neither the preimmune serum nor cross-tested antisera showed any reactivity. These polyclonal antibodies will be essential immunocytochemical tools to study the human melatonin receptors distribution at subcellular level.