Principal component analysis on mutation spectrum, for all sequences or just sequences from specific geographic regions. Each point represents a different clade. The chart is interactive:

• mouse over points for details
• click on specific clades in the legend to highlight their points
• clck on the “subset” legend to select only data from specific geographic regions
• shift-click to make multiple selections

Note that the PCA itself is not re-calculated even when some points are de-selected for display.