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Extinction of GFP expression after cell sorting. The GFP+ sorted fractions from mouse erythroleukemia cells transduced with the uninsulated (MGPN2) and insulated vectors (cHS4 vector, sns5 (S) vector, sns5 (R) vector, and sns (S) vector) were analyzed by flow cytometry, determining the percentage of GFP+ cells twice a week for 60 days. The percentages of GFP+ cells are shown on the y-axis and days of analysis on the x-axis.
