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Fig. 3. Unidirectional secretory, unidirectional reabsorptive, and net PAH fluxes
by chick PTCs following treatment with urate (330 µmol
l1), urate and estrone sulfate in combination (ES + UA), or
estrone sulfate (ES, 500 µmol l1) alone. All treatments
were administered to the interstitial and luminal sides of the epithelium at
t=0.5 h. Data are presented as the percentage of the paired
control secretory flux after 90 min exposure and are means ±
S.E.M. of three preparations. *Significantly different
from paired control flux (P<0.05, paired t-test).