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Tyrosine hydroxylase-immunoreactive intrinsic neurons in the Auerbach's and Meissner's plexuses of humans

At least 10,000 cells per sample were analyzed in duplicates and classified into PMN and PBMC based on size and granularity by flow cytometry (FACSCantoII, BD Biosciences, San Jose, USA, Supplementary Figures 1A, D )

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The reduced enzymatic activity increases cellular concentrations of both substrates that NNMT would otherwise consume: S-adenosyl-L-methionine (the universal cellular methyl donor) and nicotinamide (the NAD + salvage precursor)