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. 2022 Apr 20;604(7907):684–688. doi: 10.1038/s41586-022-04622-3

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© The Author(s) 2022

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as 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 images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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Extended Data Fig. 4 — a, Ventral part of the soft tissue crest separated from the occipital process (op) by a zone lacking soft tissue and showing only sediment (s). b, c, Detail of the basal part of the cranial crest showing dark brown structures at the base of the fibres (see arrows). d, Posterodorsal part of the cranial crest. e, f, Details of regions indicated in (d). The brown fibres of the soft tissue crest are oriented perpendicular to prominent wrinkles, expressed as variation in the topography of the specimen. Scale bars, 10 mm (a, d); 2 mm (b, c); 5 mm (e, f). op, occipital process; s, sediment; w, wrinkle.