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. 2021 Jul 8;22(14):7342. doi: 10.3390/ijms22147342

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© 2021 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).

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CD34+SCs/TCs in bullous pemphigoid. (A) Hematoxylin–eosin staining. (B–E) Double immunochemistry for CD34 (brown) and αSMA (red). Hematoxylin counterstain. (A) Subepidermal blister (b), with the presence of eosinophils in the blister cavity. (B) CD34+SCs/TCs (brown) in the superficial dermal layer. (C) CD34+SCs/TCs observed at high magnification in the interstitium of the superficial dermal layer. (D,E) Perivascular CD34+SCs/TCs surrounding a slight lymphohistiocytic infiltrate. Bar: (A) 55 µm, (B) 80 µm, (C) 15 µm, (D,E) 25 µm.