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. Author manuscript; available in PMC: 2009 Nov 18.
Published in final edited form as: Trends Microbiol. 2008 Jun 26;16(8):361–369. doi: 10.1016/j.tim.2008.05.002

Figure 2.

Figure 2

Interstrain differences in gene content among methicillin resistant Staphylococcus aureus. Concentric circles represent the circular chromosomes of USA300, COL, N315, MW2, and MRSA252. The core chromosome, consisting of genes shared by all strains of S. aureus, is shown in gray. The accessory chromosome, consisting of genes acquired through horizontal acquisition of mobile genetic elements, includes the different allotypes of SCCmec (blue), ACME (light blue), pathogenicity islands (red or green), and prophages (black).