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Fig. 4. Segmental patterns of somites and vertebral column are out of register. A region of the trunk of a 15 d zebrafish stained to reveal vertebral (arrows) and myotomal (broken line) boundaries. Viewed from the side with anterior towards the left, dorsal towards the top. Myotomes retain the original segmental pattern of the somites. Adjacent to the axis, a single myotome spans the posterior three-quarters of one vertebral centrum and the anterior quarter of the next posterior centrum. Scale bar: 45 µm.