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Methionine cycle and transsulfuration pathway. THF, tetrahydrofolate; CH2-THF, methylene-tetrahydrofolate; CH3-THF, methyl-tetrahydrofolate; MS, methionine synthase; BHMT, betaine-dependent homocysteine methyltransferase; CBS, cystathionine β synthase; CGL, cystathionine γ lyase
