Level of transduction for HSCs/HPCs and mature T cells. Transduction efficacies in percentage eGFP-positive cells for hematopoietic progenitor cells (■) and primary, stimulated mature T cells (□). For ΔTrkA, 2 cell populations (one with high, ΔTrkA^high; and one with low transduction levels, ΔTrkA^low) were prepared. TC indicates T cells.