A and B, Cellular uptake of 10 nM 3,3′-T₂ and 10 μM of MIT by COS1 cells transfected with 5–10–25 or 50 ng of FLAG-tagged LAT1, LAT2, LAT3, or LAT4 after 30 minutes of incubation. Uptake is presented as a percentage of added substrate. Significance represents EV vs different transporters. *, P < .05; **, P < .01; ***, P < .001.