Our findings indicated the changes of MSN in PSP correlated specifically with a decrease in the D2 receptor, NET receptor, MOR receptor, and two serotonin receptors (5‐HT1A and 5‐HT4), as did increases in the levels of the α4β2 and 5‐HT1B receptors (Figure 5). The gene discussed is HTR4; the disease is supranuclear palsy, progressive, 1.