These pathways include the cyst(e)ine/glutathione (GSH)/glutathione peroxidase 4 (GPX4) axis 1,4 , the ferroptosis suppressor protein 1 (FSP1)/coenzyme Q 10 (CoQ 10 ) axis on the plasma membrane 5,6 , the guanosine triphosphate cyclohydrolase 1 (GCH1)/tetrahydrobiopterin (BH4)/dihydrofolate reductase (DHFR) axis 7,8 , and the mitochondrial dihydroorotate dehydrogenase (DHODH)/CoQ system 9
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Methylcobalamin, on the other hand, skips that conversion and directly enters B12-dependent biochemical reactions
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doi:10.1210/jcem-63-2-412 Kasagi K, Iwata M, Misaki T, Konishi J