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Binding of pre-elafin to bacteria. Bright-field (left column) and fluorescence (right column) images of the same field were acquired after P. aeruginosa strains ATCC 33348 (top) and ATCC 27853 (middle) were incubated in the presence of fluorescein-labeled pre-elafin. As a control (bottom), strain ATCC 33348 was first incubated with free fluorescein prior to processing for microscopic examination.
