Naturally mutations in a Staphylococcus aureus virulence regulator attenuate cytotoxicity but permit bacteremia and abscess formation by Das, S, Lindemann, C, Allen, E, Flaxman, A, Yamaguchi, Y, Wyllie, D, Wilson, D, Young, B, Muller, J, Osterreich, B, Ternette, N, Winkler, A, Paprotka, K, Reinhardt, R, Forstner, K, Rollier-Weissenburger, C, Van Diemen, P, Blattner, S, Remmele, C, Selle, M, Dittrich, M, Muller, T, Vogel, J, Ohlsen, K, Crook, D, Massey, R, Rudel, T, Fraunholz, M