Fig. 1.

a, b Increase in number of CD44⁺ CD24^lo cells in GEM^Res MCF7 and SK-OV-3 cells. MCF7 [MFI (CD24^lo)] cells range 10–100. c CD24^lo MCF7 cells (MFI between 5 and 50) increase in number in 5-FU^Res and PTX^Res MCF7 cells. This finding was confirmed in two additional independently performed experiments