Perfused with 4% PFA, 0.1% glut. Postfixed 1 hour in same fix on ice. Left hemisphere cut into 2 mm thick coronal slabs. Tissue placed into 2.3% potassium dichromate / 0.4% OsO4 for 3 days at room temp. Tissue blotted with filter paper and then placed in 0.7% silver nitrate in dark for 3 days. Tissue was dehydrated, infiltrated and embedded in Durcupan in Beem capsules.