Phospho-Histone H3 expression in cultures derived from plated sfEB/MedII. (A,B) Morphologies of a neural progenitor rosette (A) and of neurite networks (B). (C) PhosphoHistone H3 immunostaining (red) and DAPI overlay of a neural precursor rosette. Mitotic cells within rosettes are present in the central core region. Images and scale bars: (A,B) 40×, 50 μm. (C) 60×, 25 μm.