atoh8, atoh8/myoD and atoh8/crestin expression at 24 hpf. a–c Whole mounts (lateral view, dorsal to the right) and a’, b’, c’ associated serial transverse sections. a1, a2 Flat mounts of zebrafish trunk; lateral view, anterior to the left. atoh8 is located in the deeper tissue of the somite, whereas myoD resides in the more superficial layers. Arrowheads in a, b and c pointing to hindbrain domains with strong (black arrowhead) and diminished (orange arrowhead) atoh8 signal. Arrowheads in (c’) pointing to neural crest cells of the lateral (light green) and medial (dark green) migratory pathway. Scale bars: whole embryos 200 µm, flat mounts 200 µm, transverse sections 100 µm
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