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Second, NNMT depletes that universal methyl donor, SAM, which is essential for DNA methylation, neurotransmitter production, and other indispensable biological processes

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*Correspondence: Daqing Chen, [email protected] Aiping Hu, [email protected] These authors have contributed equally to this work This article was submitted to Neuropharmacology, a section of the journal Frontiers in Pharmacology Disclaimer All claims expressed in this article are solely those of the authors and do not necessarily represent those of their affiliated organizations, or those of the publisher, the editors and the reviewers