ACME in S. epidermidis and S. aureus. Important genes on the arginine catabolic mobile element (ACME), and in its vicinity, in the genome-sequenced strains S. epidermidis ATCC12228 and S. aureus USA300 (FPR3757) are shown. Genes of the mec gene complex are shown in blue, recombinases (ccr genes) in green. opp, oligopeptide permease; pbp, penicillin-binding protein; speG, spermidin N-acetyltransferase.