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Together with the electron-impact fragmentation pattern of each identified MCF derivatised 13 C-labelled metabolite, the degree of labelling was estimated based on the variation observed in the fragmentation pattern of 13 C-labelled metabolites in comparison to their counterpart 12 C mass spectrum

Ambre J, Alexander M
Liver regeneration: biological and pathological mechanisms and implications
[PubMed: 2998878] 6