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Estimated global proportions of individuals with persistent fatigue, cognitive, and respiratory symptom clusters following symptomatic COVID-19 in 2020 and 2021

Discussion Using normal human bronchial epithelial cells as an in vitro model, the present study showed that mRNA and protein levels of FoxA2, E-cadherin, CD44, and ZO1 in bronchial epithelial cells all decreased significantly after CSE treatment, indicating abnormal differentiation of bronchial epithelial cells

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