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ΔNp63 is critical for maintenance of the most reprogrammable MEF populations. (a and c) Live MEFs from two p63−/− and one ΔNp63−/− embryos and corresponding WT littermate controls were analyzed by FACS for Thy1.2 and Sca1 cell surface expression at the indicated passages (P3-P6). (b and d) The percentage of double-negative (DN, Thy1.2-negative/Sca1-negative) and Sca1-SP cells was quantified and plotted over time
