EPCAM and Miyoshi myopathy: Thus, while EpCAM+FZD7− cells represent the largest fraction (53.8±13.4% of total cells), we observed FZD7+EpCAM+ cells (3.9±1.2% of total cells) which likely represent MM- and UB- derived progenitors and FZD7+EpCAM− cells (2.5±0.6% of total cells), which may originate solely from the MM.