Five monoclonal antibodies were produced from mice immunized with recombinant full length human ERGB protein. Among these monoclonal antibodies, four clones did not cross react with other ets family proteins and thus are specific for the ERGB protein; however, one clone did react with the ERG protein, which has high amino acid identity with the ERGB protein. The epitope location of these antibodies was studied using bacterially expressed fragments of the human, ERGB protein. These monoclonal antibodies recognized 51 kDa (p51) and 48 kDa (p48), two ERGB gene-encoded proteins, from human, mouse, and rat cell lines. These results suggest that the monoclonal antibodies can be used in human, mouse, or rat cell lines and will be useful for the biochemical and functional analysis of the ERGB protein.
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