Commentary: Trem2 Deletion Reduces Late-Stage Amyloid Plaque Accumulation, Elevates the Aβ42:Aβ40 Ratio, and Exacerbates Axonal Dystrophy and Dendritic Spine Loss in the PS2APP Alzheimer's Mouse Model - Rai, Sachchida Nand; Chaturvedi, Vivek K.; Singh, Brijesh Kumar; Singh, Mohan P. (Frontiers in Aging Neuroscience, 2020)