humanized stromal co-culture model and RESSq-PCR analysis of primary CP CML cells transduced with lentiviral-ADAR1. (A) Schematic diagram of humanized bone marrow stromal co-culture assay. CD34-selected hematopoietic stem and progenitor cells (HSPC) isolated from patients with CP CML were transduced with lenti-ADAR1 or ORF control. After 3 days of culture, cells were transferred to SL/M2 mouse bone marrow stromal monolayers for co-culture and subsequent RESSq-PCR analysis. (B,C) Increased total ADAR1 (B) and lenti-ADAR1 (C) expression in transduced CP CML samples (n = 3). (D) RESSq-PCR analysis showing increased APOBEC3D RNA editing in lenti-ADAR1 transduced cells from patients with CP CML that harbored high ADAR1 expression after transduction. Horizontal dashed lines represent comparative RNA editing activity in K562-ADAR1 and K562-ORF cells.