Primary antibodies used for immunofluorescence were against MYOD (1:20; Santa Cruz Biotechnology), MYHC (1:20; MF-20, DSHB), PERILIPIN A/B (1:100; Sigma-Aldrich), Sca-1-FITC (1:100; eBioscience), and α7-Integrin-PE (1:100; eBioscence). Oil red O was used to stain lipids, as described in Mozzetta et al. (2013) (link). Further experimental details are provided in the Supplemental Material.