In an experiment, you are trying to pull down the site where guanyl transferase binds by co-immunoprecipitation. You run a gel and autoradiograph to see a band denoting GSK-RNA pol II (phosphorylated). What will you see when you perform the same experiment with overexpression of GSK in one setup and overexpression of unlabelled GSK-RNA pol II in the other setup?

• A. Band is observed in both cases
• B. Band in 1^st case no band in 2^nd
• C. No band in 1^st case and band in 2^nd
• D. No band in both cases