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Detection of E/Orf3a channel activity in COVID-19 blood. A: whole blood samples. Pos – COVID-19-positive blood; NB – normal blood; Neg – COVID-19-negative blood. B: serum sample. Pos – COVID-19-positive serum; NP – normal plasma; Neg – COVID-19-negative serum. Vertical line: time when 4-AP was applied. RFU, relative fluorescence unit.
