Western blot analysis of Cdk2 phosphorylation in HeLa (A,D), nocodazole-treated HeLa (B,E) and serum starved HeLa (C,F) whole cell lysates. Antibodies tested include phospho-specific antibody, p-Cdk2 (Thr14/Tyr15)-R: sc-28435-R (A,B,C) and control antibody, Cdk2 (D-12): sc-6248 (D,E,F).