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pH dependence of initial rate [3H]-d-Phe-l-Gln uptake by Xenopus oocytes expressing R282 mutants of rabbit PepT1, expressed as -fold stimulation by extracellular acidification (pHout 7.4 to 5.5), the dotted line showing where there is no stimulation (n ≥ 3 oocyte preparations with at least 5 oocytes per data point for each, except for R282Q-PepT1 where n = 2; *p < 0.05 for stimulation by external acidification, one-way ANOVA).
