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Description
27 Glutathione thus shifts the equation of melanogenesis from eumelanin to pheomelanin through reactions between thiol groups and dopaquinone through formation of sulfhydryl-dopa conjugates

It might sound minor, but the distinction between these forms is really important

Most homocysteine is remethylated to methionine using methyl groups from the folate cycle or donated from trimethylglycine (also called betaine)
doi: 10.1007/s00774-012-0378-9
