Fig. 3From: Use of ceragenins as a potential treatment for urinary tract infectionsAntibacterial activities of LL-37 (filled circles), doxycyclinum (filled squares), CSA-13 (filled diamonds), CSA-131 (filled triangles) and comibination of LL-37 with doxycyclinum (empty circles), LL-37 with CSA-13 (empty squares) and LL-37 with CSA-131 (empty triangles) against four clinical strains of E. coli for 1âh at 37â°C (Panels a-d). After the addition of MTT salt, cells were further incubated for 1âh at 37â°CBack to article page