This work was supported by NIH grant NS35060. The authors would like tothank Dr. P. Davies for the PHF1 antibody, Dr. L. Binder for the Tau-1 andTau5 antibodies, and Dr. P. Seubert for the 12E8 antibody. The UAB MassSpectrometry Shared Facility is supported in part by NIH grantP30-13148-27.

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