Comparison of Neurog1 and Neurog2 expression patterns with regards to a 0.5-hour EdU pulse. (A-C) Confocal images of the same E11.5 frontal section showing combined immunostaining of Neurog1 and Neurog2 with a 0.5-hour pulse-labeled EdU on the same section. Midline is to the left. The dashed line delineates the lateral border of Neurog1-expressing cells. Arrows point to cells expressing Neurog1, Neurog2 and EdU within the lateral limit of Neurog1-expressing cells. Arrowheads point to cells that express EdU and Neurog2 but not Neurog1, located outside of the Neurog1-expressing domain. Scale bar: 50 μm.