MAPT and red-green color blindness: NFTs are composed of intra-neuronal and glial inclusions of hyperphosphorylated microtubule-associated protein Tau (MAPT), and they are widely observed in diverse tauopathies including progressive supranuclear palsy (PSP) and corticobasal degeneration (CBD), suggesting their importance for general neurodegenerative abnormalities (reviewed in Lee et al., 2001).