Persistently transdifferentiated pTD cells do not have an increase in the stem cell pool. (A) Initiation of primary or secondary mammospheres are not different between CDβGeo cells and pTD cells. (B) FACS for Aldefluor. (C) FACS for CD44 CD24. (D) FACS for Let7c sensor. (E) Limiting dilution for CDβGeo and pTD cells.