by Kerry Grens, Washington University in St. Louis Immunohistochemistry staining of activated microglia in putamen of an individual with AD (microglia labeled by marker protein P2RY12, brown, and activation indicated by TREM2 transcripts, red). Credit: Guoyan Zhao, Ph.D. Neurodegenerative disorders such as Alzheimer, Parkinson and Huntington disease each cause their own distinct set of symptoms,...