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Fig. 9. Effect of luminal pH on the time course of 20 µmol l1
3H-L-histidine (L-His) transport by perfused
lobster intestine in the presence of 20 µmol l1 zinc
(control, pH 7.1; test, pH 6.1). Values displayed are means ±
S.E.M. of 3 replicates per time point. Slopes of the lines were
calculated as regression lines using Sigma Plot software and the values on the
figure (i.e. m-values) are the slopes obtained from these analyses at
each condition used.