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Inhibition of SARS-CoV-2 replication in Vero cells by leupeptin. (A) Inhibitory curve of leupeptin against SARS-CoV-2 replication. (B) Relative concentration of vRNA present in the supernatant at 72 h postinfection determined by reverse transcription-quantitative PCR (qRT-PCR) analysis after leupeptin treatment. Continued t test P values indicate statistical significance (**, P < 0.01; ***, P < 0.001).
