FGFR3 and Alzheimer disease: Of the AD genes with evidence of somatic mosaicism, BRAF, IDH2 and KRAS were, in addition to being hematopoietic genes, involved in regulation of cell population proliferation (GO0042127) based on our gene ontology (GO) categorization (FGFR3 was also annotated to this GO term; Fig. 3).