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(a) AFM force-separation curves showing single force plateaus for pulling of T4P on a P. aeruginosa PAO1 pilT mutant during retraction of an AFM cantilever with a sharp pyramidal tip from a mica surface. (b) AFM force-separation curves showing multiple force plateaus for pulling of T4P on a P. aeruginosa PAO1 pilT mutant during retraction of an AFM cantilever with a sharp pyramidal tip from a gold surface. To see this figure in color, go online.
