Comparison of htau mRNA and protein distribution in ABCs. Transverse sections through ABCs showing the distribution of htau mRNA (Left), N-terminal htau fragment (Center), and C-terminal htau fragment (Right). Note that the htau mRNA and the N-terminal protein fragment are distributed perisomatically with htau-negative dendrites (small arrows), whereas immunostaining for the C-terminal htau fragment (which contains the MT-binding region) is strong in the distal dendrites (Right, large arrow) as well, suggesting that the C terminus is specifically involved in htau transport. The ventricular surface of the brain can be seen at the top right of each section. (Bar = 50 μm.)