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Another avenue to explore is recycling

Lalani S, Choudhry AJ, Firth B, Bacal V, Walker M, Wen SW, et al

Endothelial injury generated directly by intracellular viral replication and by ACE2 downregulation, exposing cells to angiotensin II in the absence of the modulator effects of angiotensin 17 (270, 271), and vascular chronic inflammation promoting the development of tissue macrophages overloaded by cholesterol (foam cells), both increase the possibility of acquiring a severe COVID-19 infection (209, 258, 259, 272, 273)

In a laboratory experiment, a flavonoid- and proanthocyanidin-rich sorghum extract inhibited the alpha-amylase enzymes that convert starch into sugars