Anti-DDB1 antibody reacts with human and mouse DDB1 by western blot and immunoprecipitation. The antibody immunoprecipitates in vitro translated protein and protein from cell lysates (using HeLa, NIH-3T3, and others). Coimmunoprecipitation of related proteins has not been tested. A 127.0 kDa band corresponding to human DDB1 is detected. Most cell lines expressing DDB1 can be used as a positive control. Researchers should determine optimal titers for other applications.