CD34 and acute myeloid leukemia: A recent study has shown that ROSlow AML cells are enriched for LSCs by using in vitro as well as in vivo assays.29 We identified the ROSlow and ROShigh AML CD34+ by sorting the 15% low and high subfractions based on the CellROX mean fluorescent intensity (MFI) in the AML CD34+ cell population (Figure 6a).