5-Aza-2′-deoxycytidine Activates the p53/p21Waf1/Cip1 Pathway to Inhibit Cell Proliferation - Wei-Guo Zhu; Theresa Hileman; Yang Ke; Peichang Wang; Shaoli Lu; Wenrui Duan; Zunyan Dai; Tanjun Tong; Miguel A. Villalona-Calero; Christoph Plass; Gregory A. Otterson (Journal of Biological Chemistry, 2004)