Chromatin immunoprecipitation (ChIP) assays using IgG (Upstate, Boston, USA) or antibodies specific to NFATc2, H3K4me3 (all Abcam, Cambridge, UK), RNA Polymerase II (Millipore, Billerica, USA) or STAT3 (Cell Signaling, Danvers, USA) were performed as previously described (27 (link)). Bound regions were detected by q-PCR using the following primer: CDK 6 promoter: 5´-tcccgttccactgcgtcc-3´, 5´-caagccgcttaatccttcctggtt-3´ (Biomers).