Fig. 4.

Observation of bioprinted constructs. Images of the morphology of NSCs in 3D co-axial constructs, and 2D and mixed control groups, for 2-day (A) and 7-day cultures (B), respectively. SEM images of 3D co-axial constructs (C) and mixed control (D) for a 10-day culture. H&E staining images of 3D co-axial constructs (E) and mixed control (F) for the 10-day culture.