Heat maps representing fold changes in MIC of antibiotics for AMP-resistant populations. Susceptibility to several antibiotics was measured in the S. maltophilia populations evolved in the presence of LL-37 (A), PR-39 (B), and colistin (C). Fold changes were determined using the MIC values of the parental strain D457 as a reference. CHL, chloramphenicol; TET, tetracycline; TGC, tigecycline; AMK, amikacin; TOB, tobramycin; STR, streptomycin; LVX, levofloxacin; NAL, nalidixic acid; STX, trimethoprim-sulfamethoxazole; CAZ, ceftazidime; ATM, aztreonam.