Increased intensity of Thorase immunohistochemistry in St3gal2/3 double-null mice. Sagittal sections from 8-week-old wild-type mice (A, C) and St3gal2/3 double-null mice (B, D) were subjected to Thorase immunohistochemistry under identical conditions. Detailed images of hippocampus (A, B) and cerebellum (C, D) are shown. Scale bars: 200 μm.