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Description
This can happen at specific times in your life, like during pregnancy

This reaction is catalyzed by methionine synthase, which requires vitamin B12 as a cofactor and utilizes 5-methyltetrahydrofolate (5-MTHF), the active form of folate, as a methyl donor

doi: 10.1892/0891-6640(2007)21[193:phdtai]2.0.co;2

Mol Cell Biochem 281:103110