FIP200 deletion did not affect fetal liver cell apoptosis. (A) Fetal liver tissue sections from control and CKO mice at E14.5 and E16.5 were analyzed by TUNEL assays. Arrowheads indicate the positively stained apoptotic cells. Data on the right- side graphs are mean ± SE. n = 4-5. Scale bars, 200 μm. (B-C) Annexin V labeling of fetal liver cells (B) or fetal HSCs (C) from E14.5 control and CKO embryos. Data are mean ± SE.