Updated FTP location. Tandem-mass-tags (TMT)-10plex proteomics characterized endogenous proteins expressed in HEK-293 cells transiently transfected with control vector or transporter cDNA. Proteomic profiles between mock (n=3), naïve (n=3), and HEK-293 cells transfected with MATE1 cDNA (1, 10, 30, 100 ng) were compared.