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Homocysteine metabolism gene polymorphisms (Mthfr c677t, mthfr a1298c, mtr a2756g and mtrr a66g) jointly elevate the risk of folate deficiency

Laboratory factors can also affect results, including assay interference (macro-B12) and variations in reference ranges between laboratories

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The second step in BH 4 synthesis, catalyzed by 6-pyruvoyltetrahydropterin synthase (PTPS), involves the Zn 2+ and Mg 2+ -dependent rearrangement of 7,8-dihydroneopterin triphosphate, with concommitant loss of the triphosphate, to 6-pyruvoyltetrahydropterin

306 Moreover, molecular biophysics sheds light on the mechanotransduction processes that influence ligament adaptation to mechanical stress