Our cell cycle analysis in −7 MDS stem and progenitor cells is difficult to interpret, as it was performed only within the two major CD34+CD38− (stem/primitive progenitor-containing) and CD34+CD38+ (progenitor-containing) populations, and these represent largely different stem/progenitor populations in normal and monosomy 7 bone marrow. Here, CD34 is linked to myelodysplastic syndrome.