MAPT and red-green color blindness: Our results are in line with data from 2 recent autopsy studies on 2 patients with CBD who were scanned using 18F-AV-1451 in life and where tau pathology was assessed neuropathologically postmortem.8,9 These studies suggest that there is an in vivo affinity of AV-1451 also for the 4R tau pathology in CBD, but this affinity is lower than for the 3R and 4R paired helical filaments of AD.