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Deamidation sites assigned by peptide sequencing, containing 2 potential deamidation sites: chymotryptic C8–9 component of gp41 subunit: (a) XIC of SNRN618LSEIWDN625MTW peptide-related components ([2+], 883.9 ± 0.5 Da) for selection of the relevant deamidation site for glycosite occupancy calculations; (b) the exact deamidation location is confirmed by the presence of 1214 m/z and 1215 m/z ion fragments in the corresponding N625- and D625-containing peptides
