Fig. 2: Ancestry of chromosomes containing the rare variants.

Principal component analysis (PCA) of ancestry results for a chromosome 6, containing TREM2 p.R47H (black) and TREM2 p.R62H (gray); b chromosome 16, containing PLCG2 p.P522R (black); and c chromosome 17, containing ABI3 p.S209F. Ancestral populations are European (blue), African (red), and Native American (green). Percent of distribution explained by each principal component (PC) it is shown in parenthesis