Fig. 1.

Organic anion transporters (Oats) in mammalian choroid plexus (CP). Labeled are transporters with known subcellular locations, based on specific immunostaining or transport experiments with knock-out mice (8–10). Additional transporters are known to be expressed at the message level (7). Transport studies with intact tissue have indicated additional transport pathways for which molecular correlates are lacking (4, 11, 19). CSF, cerebrospinal fluid; Oat3, Oat isoform 3; Oatp3, Oatp isoform 3; Mrp1, Mrp isoform 1.