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. 2021 Dec 21;10(1):3. doi: 10.3390/biomedicines10010003

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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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Model of normal mammary gland structure. This tissue is composed of ducts, which are formed by three epithelial populations: basal cells, in contact with the basal membrane; estrogen receptor-positive (ERα^pos) luminal cells; and estrogen receptor-negative (ERα^neg) luminal cells. The dotted black line indicates the cross-section of the mammary duct represented in the magnified scheme on the right. This figure was created with Biorender.com (accessed on 12 December 2021).