IC50 values for inhibition of transporter-mediated uptake by FPM isomers in HEK293 cells. Values are given as mean ± SEM obtained from nonlinear curve fits obtained from n=3 independent experiments, performed in triplicate (data shown in Figure 2). DAT/SERT ratio is expressed as 1/(DAT IC50) divided by 1/(SERT IC50); higher values indicate greater selectivity for DAT. NET/SERT ratio is expressed as 1/(NET IC50) divided by 1/(SERT IC50); higher values indicate greater selectivity for NET. DAT/NET ratio is expressed as 1/(DAT IC50) divided by 1/(NET IC50); higher numbers indicate greater DAT-selectivity.