The chromatin immunoprecipitation (ChIP) was performed according to the Agilent Mammalian ChIP-on-ChIP protocol version 10.0 with around 1x10^8 C2C12 cells. Magnetic beads (Dynabeads® Protein G, Invitrogen) couted with the monoclonal anit-ERRa antibody (ERRa Rabbit Monoclonal Antibody, Clone ID: EPR46Y, Epitomocs). ChIP DNA libraries were prepared for sequencing using standard Illumina protocols.