High-level transduction of human CD34⁺progenitor cells.

(A) Flow cytometric detection of EGFP or EYFP in human CD34⁺ cells transduced with either PG13- or Phoenix-GALV–derived vectors in vitro on day 3 after transduction. (B) Comparison of transduction efficiencies obtained with either PG13 or Phoenix-GALV in human and baboon CD34⁺ cells in vitro.