MAPT and supranuclear palsy, progressive, 1: The largest differences in tau load between phenotypes are found when comparing cases resulting from the application of Respondek's criteria and thus, not only are significant differences in total and subcortical tau load found between the PSP-RS/PI and PSP-P groups, but also more cortical tau is found in the PSP-Cx group with respect to the PSP-RS/PI and PSP-P groups.