CD34 and acquired polycythemia vera: PV patient-specific JAK2V617F+ (PVB1.4) and control JAK2wt (BXS0116) iPSC lines, reprogrammed from BM CD34+ cells, were differentiated for 9 days (hereafter d9) into CD34+ hematopoietic progenitors (Supplementary Materials and Methods) [14].