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PCA of the total gene content of E. faecium isolates from pigs (red, n = 71), poultry (orange, n = 65), and teal (human, n = 1,025). Isolates harboring the vanA operon (solid triangles) or the vanB operon (hollow squares), as well as van-negative isolates (solid circles), are drawn with a 95% density ellipse.
