H OH metabolites OH Article Stable Isotope-Resolved Metabolomics Shows Metabolic Resistance to Anti-Cancer Selenite in 3D Spheroids versus 2D Cell Cultures Teresa W.-M. Fan 1,*,†, Salim S. El-Amouri 1,†, Jessica K. A. Macedo 1 ID , Qing Jun Wang 2, Huan Song 1 ID , Teresa ...