The cell cycle regulator phosphorylated retinoblastoma protein is associated with tau pathology in several tauopathies.
Stone JG, Siedlak SL, Tabaton M, Hirano A, Castellani RJ, Santocanale C, Perry G, Smith MA, Zhu X, Lee HG. The cell cycle regulator phosphorylated retinoblastoma protein is associated with tau pathology in several tauopathies. J Neuropathol Exp Neurol. 2011 Jul; 70(7):578-87.