Methionine -> AdoMet Methionine -> AdoMet AdoMet -> AdoHcy AdoMet -> AdoHcy AdoHcy -> Homocysteine Homocysteine -> AdoHcy Homocysteine + _5mTHF -> Methionine Homocysteine -> Methionine Homocysteine -> Cystathionine Metin -> Methionine