Phosphorylation of tau protein in the neocortex and hippocampus in an euthermic animal (EU), in long torpor (TL), and after long arousal (AL). Immunoblots were reacted for phosphorylation-independent detection of tau (BR134), specific PHF-like tau-phospho-epitopes (AT8, AT100, AT180, AT270, PHF-1, 12E8) and tau, unphosphorylated at Ser198, Ser199, and Ser202 (Tau-1).