Representative Western blot for Pgp, Mrp1 and Actin on Gunn preparations.

Pgp expression was analyzed on microvessels (MVs) preparations (A, upper panel). Mrp1 was quantified in lateral and 4th ventricle (LV and 4thV) choroid plexuses (B, upper panel). Actin staining (both A and B, lower panel) was used to normalize the amount of samples loaded. For the quantification procedure, see the material and methods section.