CD34 and myelodysplastic syndrome: Cell cycle analysis of expanded CD34+ HSPCs at day 7 shows that the HR-MDS-MSC group had the lowest number of cells in G2/S/M phase (9.87 ± 3.1 %) compared to the healthy MSC group (35.03 ± 3.02 %, p < 0.001) (Fig. 3b).