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Binding of the SARS-CoV-2 spike (S1) protein to human pulmonary cell lines 11–18 (A) and QG-56 (B) and to the monocyte-like cell line THP-1 (C). Results are shown as column scatterplots overlayed with the mean ± SEM of at least 3 independent experiments, in which each sample was triplicated. **** p < 0.0001.
