A phosphorylation switch regulates the transcriptional activation of cell cycle regulator p21 by histone deacetylase inhibitors. - Simboeck E; Sawicka A; Zupkovitz G; Senese S; Winter S; Dequiedt F; Ogris E; Di Croce L; Chiocca S; Seiser C (The Journal of biological chemistry, 2010)