Furthermore, FTLD-tau can be subdivided into 4-repeat isoform (4R) tauopathies, such as progressive supranuclear palsy (PSP) or corticobasal degeneration (CBD), or 3-repeat isoform (3R) tauopathies, such as Pick’s disease (PiD) [33]. This evidence concerns the gene MAPT and red-green color blindness.