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(A) E13.5 FL cells from individual embryos were screened for hCD4 expression, and positive embryos were then evaluated for hCD4 expression by FACS as in Fig. 1. The proportion of hCD4+ cells in each subset is shown (n=4–6). (B) The relative MFI for hCD4 expression in hCD4+ cells in the indicated FL populations is shown, with MFI set to 1.0 for LSK/SLAM cells.
