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(a) Schematic description of FDM filament formation. Also, images of thermoplastic polyurethane (TPU)/poly(lactic acid) (PLA)/graphene oxide (GO) printed parts are shown. Green fluorescence images of cellular live/dead tests of the samples with different GO loads: (b) 0.5 wt%; (c) 2 wt%; and (d) 5 wt%. Reproduced with permission from Ref. [100].
