Double label immunofluorescence in another case of progressive supranuclear palsy. (A-C) Very few AT8-positive neurites (B, red) contain ppRbser807 (A, green, and merged image, C). (D-G) Even in fields with many ppRbser807-positive neurites (D, green) the vast majority do not colocalize with astrocytic processes marked using an antibody to glial fibrillary acidic protein (E, red, and merged image F). Scale bar = 50 μm.