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. 2020 Feb 3;10:1693. doi: 10.1038/s41598-020-58628-w

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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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Human scalp tissue stained immunohistochemically for CD34. (a) CD34⁺ cells (TCs) (black arrow) were in the deep dermis and subcutaneous tissue (40×). (b) A few TCs body (black arrows) with their Tps (red arrows) extended parallel to the adjacent epidermis (100×). (c) The spatial relationship of TCs body (black arrows) with their Tps (red arrows) and a blood vessel (yellow arrow) (100×). (d–g) TCs body (black arrows) and their Tps (red arrows) surrounded deep segments of HFs (d, 100×), sebaceous glands (e, 200×), secretory or ductal parts of the sweat glands (f, 200×) and intervals of adipose lobules (g, 200×). (h) TCs body (black arrows) and their Tps (red arrows) bordering the bulge and sub-bulge areas of HFs (200×).