SDS-PAGE (A) and Western immunoblot (B) analysis of SDS surface protein extracts. Lane M, marker; lanes 1 to 3, S. aureus strains CI7 (lane 1), Wood 46 (lane 2), and Newman (lane 3); lanes 4 to 8, strains of non-S. aureus staphylococcal species S. epidermidis (lanes 4 and 5), S. carnosus subsp. carnosus (lane 6), S. haemolyticus (lane 7), and S. hominis subsp. hominis (lane 8). Blots were prepared as described in Materials and Methods.