(K) FACS-isolated SCs from YY1iKO mice were infected with YY1 expressing or control viruses, followed by immunostaining for Pax7 (green) and MyoD (red) 36 hrs post-transfection. Scale bar = 100 µm. Quantifications of the numbers of each population, Pax7+MyoD-, Pax7-MyoD+, or Pax7+MyoD+, are shown on the right (n=3 mice, each). 