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Influence of quinine, H-CQN, and CQN on the cell viability of A549-ACE2 and A549-ACE2/TMPRSS2 cells. Similar to the drug treatment scheme described in Figure 2, the influence on cell viability was measured in (a) A549-ACE2 or (b) A549-ACE2/TMPRSS2_c1 cells by WST-1 assays. Quinine-sulfate was used as Q-L or Q-S. Bars represent mean values of 3 independent experiments ±SD.
