Highlighted are the high positive correlations between phosphorylated peptides in SI and the disease associated MTBR peptides in SI, i.e., non-isoform-specific 354–369 for all diseases (AD r = 0.72–0.89, p < 0.03; PSP r = 0.55–0.77, p < 0.09; CBD r = 0.91–0.97, p < 0.001; PiD r = 0.95–0.96, p < 0.0001), 4R for AD (r = 0.75–0.95, p < 0.02), PSP (r = 0.63–0.87, p < 0.04), and CBD (r = 0.94–0.98, p < 0.001), and 3R for AD (r = 0.76–0.90, p < 0.02) and PiD (r = 0.97–0.99, p < 0.0001). Here, MTA2 is linked to Alzheimer disease.