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To demonstrate the finding of a previously unknown transsulfuration reaction distinct from the known ligation reaction, we first examined the isotopologue patterns of key metabolite substrates such as glutamate, glycine, serine, and cysteine in 293T cells labeled by a mixture of isotopic tracers ([U- 13 C]-glutamine, [U- 13 C]-glucose, and [U- 13 C]-acetate) (Fig

Positive mode: Cysteine-NEM (m/z 247 m/z 158

of Radiology, Medical Physics, Medical Center University of Freiburg, Faculty of Medicine, University of Freiburg Des Moines University Desai Seth Urology Institute Deutsches Elektronen-Synchrotron DESY Deutsches Herzzentrum Berlin Deutsches Krebsforschungszentrum (DKFZ) Deutsches Krebsforschungszentrum Heidelberg Deutsches Zentrum fr Neurodegenerative Erkrankungen e.V

Wang, X., Lawson, J