(L) Single EDL myofibers were cultured for 3 days, followed by immunostaining for Myogenin (red) and MyoD (green). Scale bar = 50 µm. Quantifications of the numbers of each population, MyoD+Myog+, MyoD-Myog+, or MyoD+Myog-, are shown on the right (n=3 mice, each). 