Fig. 6From: Advances in the development of tubular structures using extrusion-based 3D cell-printing technology for vascular tissue regenerative applicationsCoaxial extrusion 3D cell-printing of microtubes using (a) GelMA/alginate, (b) nanoclay/N-acryloyl glycinamide (NAGA)/GelMA, and (c) GelMA/PEGDA/alginate/lyase Reproduced from [105,106,107] with permission from Wiley–VCH Copyright 2015, 2020, and American Chemical Society Copyright 2020Back to article page