Alzheimer Disease 15, also known as alzheimer disease without neurofibrillary tangles, is related to alzheimer disease 19. An important gene associated with Alzheimer Disease 15 is AD15 (Alzheimer Disease-15), and among its related pathways/superpathways is Cyclin A/B1/B2 associated events during G2/M transition. Affiliated tissues include cingulate cortex and temporal lobe, and related phenotypes are Decreased viability after Maraba virus infection and Increased homologous recombination repair frequency