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. 2020 Oct 23;6:33. doi: 10.1038/s41540-020-00153-7

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© The Author(s) 2020

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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Fig. 2 — The inner circle indicates lipid groups: neutrolipids (NL), glycolipids (GL), sphingolipids (SL) and phospholipids (PL). Lipids are represented in the intermediate circle as belonging to the different groups of the inner one; therefore, PL are constituted by phosphatidylcholine, cardiolipin, phosphatidic acid and phosphatidylglycerol, SL by sphingomyelin, GL by glycolipids and NL by cholesterol and diacyl-glycerol. Each lipid is then represented in the outer circle with their average fatty acid chains composition: the different proportions are made of palmitic acyl chains (C16:0), palmitoleic acyl chains (C16:1), stearic acyl chains (C18:0), oleic acyl chains (C18:1) and linoleic acyl chains (C18:2).