Fig. 6. Effect of varying luminal L-histidine concentration (150
µmol l1) on transmural transport rate of 20 µmol
l1 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.