We found that, in the occipital white matter, the levels of MOBP 20.8–23.3 kDa are inversely correlated with the MSA disease duration (r = −0.93, p = 0.008), i.e., the levels of these MOBP isoforms are decreased in patients with longer disease duration, while HIP1 shows the opposite trend (r = 0.75, p = 0.084; Figure S6). This evidence concerns the gene HIP1 and multiple system atrophy.