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Studies have shown that retinoic acid can regulate MAPK, AMPK and other signaling pathways, which are closely related to the maintenance of cell redox state

Availability of data and materials Data sharing not applicable to this article Abbreviations B12: Vitamin B12 DOAJ: Directory of Open Access Journals HC: Haptocorrin Hcy: Homocysteine IF: Intrinsic factor IOM: Institute of Medicine MRI: Magnetic resonance imaging MS: Multiple sclerosis SCD: Sub-acute combined degeneration TCI: Transcobalamin I UL: Upper intake level References Aaron, S., Kumar, S., Vijayan, J., Jacob, J., Alexander, M., & Gnanamuthu, C

10.1242/dev.01074 Development 136 LeComteM

doi: 10.1016/j.jsps.2009.12.007 158