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SEM micrographs of the exposed block surface following ultramicrotomy. a Image of the CNTSmall sample protruding slightly from the microtomed surface. b A CNTLarge sample after microtomy, where large protruding CNTs are seen which in some cases have left an impression in the Epon block during flattening. c Low magnification overview of how lung tissue in close proximity to CNTs can be visualised and later targeted with FIB-SEM
