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[Preprint]. 2022 Jul 26:2022.04.20.488969. [Version 2] doi: 10.1101/2022.04.20.488969

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graphic file with name nihpp-2022.04.20.488969v2-f0004.jpg — As a control, we also tested the ability of trypsin to cleave selected S1/S2 peptides. All variants were cleaved more effectively than for the prototype B.1 virus (Wuhan Hu 1), with B.1.1.529 (Omicron) showing the most cleavability.