Cell wall structure of

M luteus is disrupted in lesions of F2 control mice but preserved in lys M^−/− mice. At 7 hours after infection, the infected lesions of F2 controls (A) contain bacterial cell wall fragments and ghosts (short arrows), but lys M^−/− mice (B) show bacteria with well-preserved cell walls and normal electron-dense cytoplasm (long arrows). Bars, 0.2 μm.