PAX7 and Duchenne muscular dystrophy: We found similar results when we repeated the experiment using NSG-mdx4Cv recipients (Figure 2C), namely that male and female WT Pax7-ZsGreen cells engrafted into the satellite cell pool equally well; however, the average number of Pax7-ZsGreen cells after transplantation of 300 cells into NSG-mdx4Cv recipients was significantly lower than that seen in the WT C57BL6/J recipients, suggesting that the DMD pathology suppresses their ability to contribute, possibly by exposing transplanted cells to a more stressful environment (Figure S1A,B).