Western blot analysis of Chk2 phosphorylation in untreated (A,D), UV irradiated (B,E) and UV irradiated and lambda protein phosphatase treated (C,F) HeLa whole cell lysates. Antibodies tested include p-Chk2 (Thr 68)-R: sc-16297-R (A,B,C) and Chk2 (C-18): sc-8813 (D,E,F).