Figure 1
From: High mammographic density in women of Ashkenazi Jewish descent
Principal component analysis of participants from our study and additional reference samples of known ancestry. The first principal component (PC1) separates people of Ashkenazi Jewish ancestry from other European groups. The vertical dotted lines separate the Ashkenazi Jewish and Northern European clusters from the middle group. The diagonal dotted line divides the probably mixed Ashkenazi-other European group (higher values on the second principal component (PC2)) from the Southern European group (lower values on PC2).