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. 2017 Dec 7;7:17109. doi: 10.1038/s41598-017-16840-1

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© The Author(s) 2017

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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Development of the caudate and quadrate lobes. Posterior (A,C,E,F) and posterio-caudal (B,D) views at CS16 (A,B), CS18 (C,D), CS20 (E) and 10 weeks (F). The caudate lobe (interrupted line) appeared at CS16 and the quadrate lobe (Q; black line) at CS18, were supplied by branches from the portal sinus (black open arrowheads), and were drained by the intrahepatic caval vein and middle hepatic vein (black arrowheads), respectively. The number and length of hepatic-vein branches that drain unto the intrahepatic caval vein (blue) varies (dotted lines; A,C,E,F) and, therefore, the boundary of the caudate process is variable.