"G-CSF (Csf3) gene in myofibers is regulated by MyoD in a metabolism-dependent manner. Furthermore myofiber-secreted G-CSF acts as a metabolic niche factor required for establishing and maintaining the Pax7(Hi) SC subpopulation in adult and physiological aged mice by promoting the asymmetric division of Pax7(Hi) and Pax7(Mi) SCs."xsd:string