Additional file 4: of Characterization of the biological processes shaping the genetic structure of the Italian population

PCA of European and Mediterranean populations. (A) Plot of the first two principal components of the Italian population combined with populations from continental Europe and Mediterranean area; (B) geographical localization of the analyzed samples. Legend of symbols and colors used is reported below. The map of European/Mediterranean area was obtained plotting a suitable portion of the spatial world data downloaded from http://thematicmapping.org/. (PDF 1212 kb)