AQP4 independent staining of false NMO-IgG positive sera.

<p>WT (A) and AQP4 knockout (B) brain sections were stained with a serum showing NMO IgG-like staining at low magnification. Inset (A) shows that the serum staining (green) is restricted to endothelial cells of the brain capillaries and not to astrocyte processes stained red by AQP4 antibodies. (B) Staining of AQP4−/− mouse endothelial cells of the serum under analysis. Magnification bar 10 µm.