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Fig. 5. FL accumulation in Malpighian tubules of Drosophila, and its
inhibition by several potential substrates. N=3 tubules for each.
PBD, 3-phenobenzoic acid (1 mmol l1); PAH,
p-aminohippuyric acid (3 mmol l1); PBA, probenecid
(0.5 mmol l1). *Change in uptake rate (second
measurement period relative to first measurement period) in presence of
inhibitor significantly different from uptake rate in absence of inhibitor;
P<0.05, paired t-test.