PROM1 and cancer: Notably, CD133, which is expressed in ES cells and cancer stem cells (93.1% of NTERA-2 was positive as shown in Supplementary Fig. 1c)28, was 2.0% positive in hBM-Muse cells and 0.8% positive in hAMSCs, while it was as high as 71.5% in hAMSC-SSEA-3(+) cells (Fig. 1k, Supplementary Fig. 1c).