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Confocal photomicrographs (optical sections) of transverse sections of shh-GFP zebrafish cerebellum at 3 dpf (A,C) and 4 dpf (B,D) immunostained for parvalbumin and PH3. Arrows point out mitotic PH3 positive cells which are neither GFP nor parvalbumin positive. Scale bar in (A): 10 μm (applies to all panels).
