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Changes in the fluorescence of FITC-Ahx-H-d-(Dabcyl) peptide substrate in the presence of various concentrations of Covid-19 live virus (108–10 pfu/mL) after 30 minutes and 3 hours of incubation at 37 °C. The samples were excited at 485 nm and the fluorescence was observed at 535 nm. The standard errors were calculated from the three different measurements
