Cep55 deficiency does not affect the mitotic progression in cerebral cortex, related to Fig. 2. (A) E13.5 Cep55^+/+and Cep55^−/− cerebral cortex coronal sections were stained with mitotic marker (p-H3, green) and DNA (blue). Scale bar, 50 µm. (B) Percentage of p-H3–positive (p-H3⁺) cells in the cerebral cortex in A, calculated per unit ventricle length (100 µm). n = 3 embryos each. Data are presented as means ± SD of three independent experiments. An unpaired two-tailed t test was performed.