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Fig. 1. Flow cytometry of fresh CD34+- immunodepleted cells (A) and
cells following 6 weeks of selection in vitro (B). (A) Immunomagnetic
depletion of the initial mononuclear fraction resulted in approximately 100%
elimination of CD34+ cells, whereas up to 80% of cells expressed
CD45 antigen. (B) Following 6 weeks of culture of CD34+- depleted
cells in conditions described in the Materials and Methods, CD45+
cells were reduced to almost negligible levels (less than 4% of the whole cell
population).