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. 2023 Jul 3;11(3):30. doi: 10.3390/jdb11030030

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© 2023 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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In situ hybridization of the stem cell marker K15 and differentiation marker K75 in avian reticulate and reptilian tuberculate scales. (A) K15 and K75 mRNA expression in chicken reticulate scales. Note: K15 is sporadically expressed in the basal epidermis of both the hinge (red arrows) and surface (green arrows) of chicken reticulate scales. (B) K15 and K75 mRNA expression in alligator tuberculate scales. Note: K15 is expressed in the hinge (blue arrows) but not in the surface regions of alligator tuberculate scales.