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Fig. 3. FS colonization by B committed precursors at E13. (A)
CD45+ Ter119- cells from E13.5 FS and FL were sorted and
analyzed by RT-PCR for the expression of transcription factors involved in B
cell commitment: E47, Ebf and Pax5. E15 FL cells depleted of
erythrocytes were used as a positive control. (B) FS and FL from E13.5
Rag2GFP transgenic embryos were scored by FACS for B220
and CD43. We also obtained B220+ CD43+ B progenitors
that express GFP.