We thank Dr. M. Goedert for his kind gift of antisera 133 and 134 and Drs. P. Davies and F. P. Zemlan for kindly providing us with mAbs PHF1 and P262-7. This work was supported in part by grants to D.M.M. from the U.S.-Israel Binational Science Foundation (grant 95/16), from the Israel Fund for Basic Research (grant 670/96), from the Eichenbaum Foundation, and from the Revah-Kabelli Fund. D.M.M. is the incumbent of the Myriam Lebach Chair in Molecular Neurodegeneration at Tel Aviv University. We thank Mrs. Angela Cohen for editorial assistance.

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