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SEM micrographs of P. aeruginosa incubated for 7, 14 and 21 days on CTL (A–C) and HTE surfaces (D–F). Yellow arrows are highlighting irregular morphology and dead cells: Red arrows show EPS covering bacteria. Scale bar bottom left = 2 μm. (For interpretation of the references to colour in this figure legend, the reader is referred to the Web version of this article.)
