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Dose dependence of SARS-CoV-2 spike protein pseudoviruses: HEK293T-hACE2 cells seeded in 96-well plates were infected with increasing concentrations of SARS-CoV-2 spike protein pseudoviruses. Intracellular luciferase signal (as a marker of spike protein-mediated pseudovirus infection) measured at the end of 3 days is shown on the Y-axis. Triangles–614D variant, Circles–B.1.1.7 UK variant, squares boxes–B.1.351 SA variant.
