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Theaflavin inhibits 3CL-protease in vitro. (a) Theaflavin was incubated with 3CL-protease, and the 3CL-protease activity was determined. (b) IC50 of theaflavin was calculated and shown in the graph. Control vs theaflavin treatment: ∗∗p < 0.01,∗∗∗p < 0.001.
