The viral oncoprotein E1A blocks transforming growth factor beta-mediated induction of p21/WAF1/Cip1 and p15/INK4B.
Datto MB, Hu PP, Kowalik TF, Yingling J, Wang XF. The viral oncoprotein E1A blocks transforming growth factor beta-mediated induction of p21/WAF1/Cip1 and p15/INK4B. Mol Cell Biol. 1997 Apr; 17(4):2030-7.