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LC-MS/MS quantification (mean ± SEM) of (a) niacinamide (n=9) and (b) 1-methyl-niacinamide (n=3), and (c) normalized time–dependent quantification of niacinamide (n=9) and 1-methyl-niacinamide (n=3) in sample homogenates. SEM, standard error of the mean.
