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A B C Supplemental Digital Content 3. (A) Aged E391 transgenic mice (E391-3608) fail to develop silver positive neurofibrillary tangles in the entorhinal cortex (detected by Gallyas silver stain). (B) In contrast, numerous Gallyas-positive silver deposits are detectable in the entorhinal cortex of transgenic mice harboring the P301S tau mutation (PS19). (C) Higher magnification of entorhinal cortex shown in (B). Scale bars = 100 µm