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(a–d) Negative ion CID spectra (transfer region) of bisected biantennary complex glycans (32–38) from human parotid gland extracts. Symbols and linkages for the structural diagrams are as defined in the footnote of Table 1. Nomenclature of the ions is shown in (a). Ions marked with an asterisk are from isobaric biantennary glycans containing an additional N-acetylamino group, produced as a by-product of the hydrazinolysis-reacetylation release method
