CD68 and tauopathy: As expected, microvessel length was negatively associated with the level of tauopathy marker (r = −0.56, p < 0.0001), with CD68+/Iba1+ microglia (r = −0.47, p = 0.0001) and with CD3+/CD8+ T lymphocytes (r = −0.48, p < 0.0001).