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. 2021 May 12;11:10123. doi: 10.1038/s41598-021-88961-7

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© The Author(s) 2021

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 licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence 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 licence, visit http://creativecommons.org/licenses/by/4.0/.

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Macrophages in the AGM can be divided into 4 morphological subgroups. (a) The drawing shows a 3D view of vessels and macrophages (red) imaged in (b). (b) 3D view of the AGM in the mid-trunk region of a Tg(kdrl:eGFP//mpeg1:mCherry-F) zebrafish embryo at 48 hpf showing the position of vessels (endothelium in green) and macrophages (in red, white arrows) in the outer side of the vein and in between the dorsal aorta and the cardinal vein. (c) 3D scatter plot showing the 3 attributes (circularity, roundness and elongation factor) used to divide macrophage to their shape categories; plot was generated in R using rgl package²⁵. (d) Diagram of the decision chart for the 4 categories of macrophages delineated according to shape attributes. (e) Representative confocal images (maximum intensity projections) of individual categories with an outline drawing from particle analysis on the right. (f) Graph representing the percentage distribution of the different shape categories per AGM. Data are represented as percentage average ± s.e.m. N = 20 embryos. C caudal, D dorsal, DA dorsal aorta, PCV posterior cardinal vein, R rostral, V ventral. See also Supplementary table S1.