Fig. 1

Core and pan genome of E. faecium strains. The number of shared genes was plotted as a function of number of strains (n) added sequentially. 1935 genes were shared by all 10 genomes. The orange line represents the least-squares fit to the power law function f(x) = a.x^b where a = 2577.54, b = 0.222602. The red line represents the least-squares fit to the exponential decay function f1(x) = c.e^(d.x) where c = 2293.44, d = − 0.0232013