Fig. 3. Inhibition of FL accumulation by mono- and dicarboxylic acids representing a range of sizes (as indicated by the number of carbons in the backbone). Sample sizes range from 3 to 7 tubules, except for `no inhibitor', which represents all control trials (N=27). ^*Change in uptake rate (second measurement period relative to first measurement period) in the presence of inhibitor significantly different from uptake rate in absence of inhibitor; P<0.05, paired t-test.