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Fig 4. Chemical structure of NAA and N-acetylated glycoproteins. The common CH3 moiety of N-acetyl compounds (box) in NAA (A) and N-acetyl glycoproteins (B and C) is highlighted. MR spectroscopy will detect the electrons in the CH3 chemical bond, and the metabolite peak at 2.0 ppm will be positive for NAA as well as N-acetyl glycoproteins.
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