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. 2023 Oct 19;101(12):1527–1542. doi: 10.1007/s00109-023-02385-6

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© The Author(s) 2023

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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Fig. 2 — Expression levels of selected HERVs and their receptors in placental tissue. Chorionic villi and trophoblast populations in a 28-gestational-week placenta with a schematic cartoon representation of chorionic villus (left). Expression levels of genes coding syncytin-1 (ERVW-1), syncytin-2 (ERVFRD-1), suppressyn (ERVH48-1), and their receptors (SLC1A5, SLC1A4, MFSD2A) in trophoblast populations (right); nTPM, normalized protein-coding transcripts per million. Expression data from proteinatlas.org. The placenta was stained by hematoxylin and eosin. An image of the placenta was taken by light microscope Axio Vert. A1 in software Axio Vision 4.8 (Zeiss) by Lajos Gergely, MD (Institute of Medical Biology, Genetics and Clinical Genetics, Faculty of Medicine, Comenius University Bratislava, Bratislava, Slovak Republic). Created in biorender.com