On of C1 components were purchased from Sigma (St. Louis, MO
On of C1 elements were purchased from Sigma (St. Louis, MO). Lmethionine (methyld3) and D,Lcysteine (three,3d2) were purchased from Cambridge Isotope Laboratories (Andover, MA). SAdenosylLmethionined3 (Smethyld3) tetra (pToluenesulfonate) Salt was…