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(a) Schematic illustration of two-photon polymerization (TPP). Reproduced with permission [42]. Copyright 2012, Elsevier Ltd. (b) SEM images of the patterned surfaces by TTP. Reproduced with permission [52]. Copyright 2013, American Chemical Society. (c) SEM images (on the left) and 3D rendering of a z-stack confocal acquisition (on the right) of PC12 and SH-SY5Y cells. Reproduced with permission [52]. Copyright 2013, American Chemical Society.
