Thin sections of S. aureus 2PF-18 exposed to antimicrobial peptides. S. aureus cells were reacted with no peptide (panel 1), with 200 μg of hBD1 per ml (panels 2a and 2b), with 200 μg of hBD2 per ml (panels 3a and 3b), with 200 μg of hBD3 per ml (panels 4a and 4b), or with 200 μg of CAP18 per ml (panels 5a and 5b). Bars, 100 nm.