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(A) Typical coaxial nozzle configuration (reproduced with permission from [67], Copyright 2016 IOP Publishing Ltd.); (B) Perfusable hollow vascular structure (reproduced with permission from [18], Copyright 2015 Elsevier); (C) 2D patterns built by perfusable tubes (reproduced with permission from [66], Copyright 2016 Elsevier); (D) Vessel-like structures with multilevel fluidic channels (reproduced with permission from [65], Copyright 2017 American Chemical Society).
