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N-acetylneuraminic acid (NeuNAc), the most naturally abundant sialic acid, is incorporated as the terminal residue of mammalian cell surface glycoconjugates and acts as a key facilitator of cellular recognition, adhesion and signalling. Several pathogenic bacteria similarly express NeuNAc on their cell surfaces, allowing evasion of their host's immune system. Prokaryotic NeuNAc biosynthesis proceeds...