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Then, 5 L of 200 mM DTT was added and incubated for 40 min at 60C

Maybe all three

When it comes to the functioning of your cells, methyl groups are used in methylation reactions.[ref] Examples of methylation reactions include: synthesis of some of the nucleic acid (DNA) bases turning off genes so that they arent transcribed (DNA methylation) converting serotonin into melatonin methylating arsenic so that it can be excreted breaking down neurotransmitters metabolizing estrogen regenerating methionine from homocysteine Methylation in the right amount: For example, you need enough folate (vitamin B9) and methylcobalamin (vitamin B12) for the methionine synthase reaction to occur

Oral and Sublingual Forms For individuals without absorption issues, tablets and sublingual drops or sprays may suffice for maintenance