Tau is an alias for the gene, Microtubule associated protein tau, in humans. Other names include: Microtubule-associated protein tau; Neurofibrillary tangle protein; Paired helical filament-tau; PHF-tau; G protein beta1/gamma2 subunit-interacting factor 1; microtubule-associated protein tau, isoform 4; protein phosphatase 1, regulatory subunit 103; DDPAC; FTDP-17; MAPTL; MSTD; MTBT1; MTBT2; PPND; PPP1R103; TAU. The encoded protein has an amino acid length of 758 and a mass of 78.9 kDa. Other isoforms may exist. This gene shares homology with other species, including: Frog.