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Fig. 3. Effect of varying luminal zinc concentration (1–50 µmol l–1) on transmural transport rate of 20 µmol l–1 3H-L-histidine over 30 min time intervals at each luminal zinc concentration. Unidirectional fluxes were calculated from regression slopes determined over this time interval for each zinc concentration. Values displayed are means ± S.E.M. of 3 replicates per concentration.