antibodies against the following proteins: MTH1 (NB100-109, Novus Biologicals),
p53 (sc-126, Santa Cruz Biotech), p21cip1/waf1 (sc-817, Santa Cruz
Biotech), phospho-Akt (4060, Cell Signaling) total Akt (9272, Cell Signaling),
cleaved-PARP (9541, Cell Signaling), p-Erk1/2 (9101, Cell Signaling), total Erk
(9102, Cell Signaling), p27kip1 (sc-528, Santa Cruz Biotech), KRAS
(sc-30, Santa Cruz Biotech), tubulin (sc-8035, Santa Cruz Biotech), actin
(ab82266, Abcam) and GAPDH (ab9485, Abcam). Western blotting images represent
data consistent with a minimum of two independently established sets of samples.
Densitometry of images was carried out via the ImageJ Analyze Gels module.