STX6 and red-green color blindness: Furthermore, whereas several previously reported PSP and CBD risk variants39,40,41 showed negligible association, some PSP risk markers reached p values in the range of 10−3 (rs1411478 [STX6; MIM: 603944] and rs11568563 [SLCO1A2; MIM: 602883]) and 10−4 (rs1768208 [MOBP]) in our dataset.