This article from 2004 shows that the ACE2 receptor, the use that SARS-CoV2 attaches to enter cells is located in multiple tissues of the human body, specially in lung alveolar epithelial cells, enterocytes, vascular endothelial cells, and arterial smooth muscle cells. This particular distribution helps us understand the clinical manifestations of COVID-19.

Link to the article.
Link for the pdf article.

To quote this article in bibliography:

Hamming, I, Timens W, Bulthuis MLC, Lely AT, Navis GJ and van Goor H. “5Tissue distribution of ACE2 protein, the functional receptor for SARS coronavirus. A first step in understanding SARS pathogenesis." Journal of Pathology 203, no. 2 (2004): 631-637. doi: https://doi.org/10.1002/path.1570

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