Myosphere-derived cells express Myf5.

<p>(A) Graph showing the percentage of myosphere-derived cells isolated from YFP-Myf5 mice that express YFP versus the number of days these cells had remained in culture. Shown are two independent myosphere isolations. N refers to the number of random fields counted. (B-H) Representative pictures showing the growth of myospheres and the expression of YFP in myosphere cultures isolated from YFP-Myf5 mice. Shown are pictures from (B) 1, (C) 4, (D) 6, (E) 15, (F) 22, (G) 26, and (H) 32 days after isolation. Scale bar represents 50μm.