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. 2018 Jan 9;4:1. doi: 10.1186/s40851-017-0083-6

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© The Author(s). 2018

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

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Fig. 3 — Comparison of ectomesenchyme-mesoderm distribution in the cranium between the crown gnathostome (chicken; based on the description by Couly et al., 1993) and the lamprey larva. Modified from reference [24]. Crest-derived cells are shown in red, mesodermal cells in blue. Notochord is represented by thick black lines. Note that the chordal cranium is coextensive with the notochord. In the chicken, the prechordal cranium is represented by the interorbital septum, whereas in the lamprey, the ectomesenchymal cranium is exclusively oro-pharyngeal, and the neurocranium is made of mesoderm. Ios, interorbita septum; nas, nasal capsule; nc, neurocranium; ot, otic capsule