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Individual cathepsins cleave SARS‐CoV‐2 spike protein generating unique cleavage fragments. 5 ng/μl of SARS‐CoV‐2 spike protein was incubated with 5 p mol of cathepsins B, K, L, S, V or no enzyme for increasing periods of time. Samples were collected and prepared for reducing immunoblot with anti‐SARS‐CoV‐2 spike. Representative blot after 10 min of incubation is shown
