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Fig. 6. Effect of varying luminal L-histidine concentration (1–50 µmol l–1) on transmural transport rate of 20 µmol l–1 65Zn2+over 30 min time intervals at each luminal L-histidine concentration. Unidirectional fluxes were calculated from regression slopes determined over this time interval for each L-histidine concentration. Values displayed are means ± S.E.M. of 3 replicates per concentration.