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Fig. 3. Effect of varying luminal zinc concentration (150 µmol
l1) on transmural transport rate of 20 µmol
l1 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.