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[118] Methionine synthase [edit] Methionine synthase, coded by MTR gene, is a methyltransferase enzyme which uses the MeB 12 and reaction type 2 to transfer a methyl group from 5-methyltetrahydrofolate to homocysteine, thereby generating tetrahydrofolate (THF) and methionine
Nausea or Diarrhoea In rare cases, Vitamin B12 shots can cause gastrointestinal discomfort such as nausea or diarrhoea
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