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Rationale
We report the N‐glycosylation pattern of Sf9 insect cell‐derived recombinant spike proteins being developed as candidate vaccine antigens for SARS‐CoV‐2 (COVID‐19) (Sanofi). The method has been optimised to produce peptides with single, isolated glycosylation sites using multiple protease digests. The development and use of glycopeptide libraries from previous developmental phases allowed...