PECAM1 and tauopathy: In contrast to CD31, pCD31 level was positively correlated with the tauopathy marker (r = +0.40, p = 0.002), with the CD68+/Iba1+ microglia (r = +0.45, p = 0.0003) and with CD3+/CD8+ T lymphocytes (r = +0.54, p < 0.001; bottom row).