Figure 2. Meta- and para- ²¹¹At-PA transport in an in vitro cellular uptake and inhibition assay conducted in the absence or presence of 1 mM non-radiolabeled phenylalanine (PA) or 20 mM 2-aminobicyclo-(2,2,1)-heptane-2-carboxylic acid (BCH; system L amino acid transporter inhibitor).

(A) C6 glioma, (B) U-87MG, and (C) GL261 cell lines [^* p < 0.05 and ^** p < 0.01 compared with control (CTL)]. Uptake data are expressed as mean values ± standard errors of the means (four replicates per condition).