Specificity: Reacts with the human Cks1 protein. On Western blots, it identifies a single band at ~11kD. Bands of unknown origin at ~20, 30 and 100kD are also observed. Reactivity has been confirmed with HeLa cell lysates by Western blotting, immunofluorescence and immunoprecipitation, and with non-small cell lung carcinoma tissue by immunohistochemistry. Western blotting with purified Cks1 and Cks2 proteins was used to confirm that this antibody does not cross-react with Cks2. Cross-reactivity with mouse is expected based upon amino acid sequence homology.