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Each protomer in the trimeric spike has 22 glycosylation sites. How these sites are glycosylated may affect which cells the virus can infect and could shield some epitopes from antibody neutralization. Watanabe\n                    <jats:italic>et al.<\/jats:italic>\n                    expressed and purified recombinant glycosylated spike trimers, proteolysed them to yield glycopeptides containing a single glycan, and determined the composition of the glycan sites by mass spectrometry. The analysis provides a benchmark that can be used to measure antigen quality as vaccines and antibody tests are developed.\n                  <\/jats:p>\n                  <jats:p>\n                    <jats:italic>Science<\/jats:italic>\n                    this issue p.\n                    <jats:related-article xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" ext-link-type=\"doi\" issue=\"6501\" page=\"330\" related-article-type=\"in-this-issue\" vol=\"369\" xlink:href=\"10.1126\/science.abb9983\">330<\/jats:related-article>\n                  <\/jats:p>","DOI":"10.1126\/science.abb9983","type":"journal-article","created":{"date-parts":[[2020,5,4]],"date-time":"2020-05-04T15:11:21Z","timestamp":1588605081000},"page":"330-333","source":"Crossref","is-referenced-by-count":1483,"title":["Site-specific glycan analysis of the SARS-CoV-2 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