HNRNPA2B1 and red-green color blindness: The proportion of neuronal nuclei stained for hnRNP A2B1 was similar in the frontal cortex from control, CBD, PiD, and PSP cases (Figure 4G); however, it was noted that PSP neurons displayed very wide ranges in hnRNP A2B1 levels with a few very bright cells observed (Figure 4C).