Figure 3:

A,B) Flow behavior of the extruded fiber structures before and after perfusing, C) Permeability and diffusion of the dye in 40 minutes, D) 90° orientation of the layers during bioprinting and subsequent perfusion of the dyes. Uniform diffusion of the red dye evidenced the high penetrability of the printed alginate-gelatin shell system, allowing high cell migration levels. Adapted with permission from [21].