Ccbe1^lacZ expression in prenatal and postnatal sites of erythropoiesis. (A,B) X-gal staining of E14.5 Ccbe1^lacZ and littermate control fetal liver is shown. (C,D) X-gal staining of bone marrow stroma from Ccbe1^lacZ and littermate control animals. Brain tissue from each animal was used as a control for the staining process (insets). (E,F) X-gal staining of Ccbe1^lacZ and littermate control spleen. (G) FACS-Gal analysis of hematopoietic cells from the fetal liver, bone marrow, and spleen of Ccbe1^lacZ and littermate control animals is shown.