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Chemical reporters for metabolic labeling of bacterial surface glycans. (a) Structure of LPS core and lipid A. (b) az-Kdo [40]. (c) az-Fuc and its target, E. coli O-antigen [42]. (d) az-Man-di-2,4-NAc and its target, L. pneumophila serogroup 1 O-antigen [43]. (e) GalNAz and its labeling of CPS [44].
