Fig. 4: a) Scheme of the perfusion chamber consisting of an upstream and downstream chamber, perfusion ports, and removable scaffolds to stabilize the microgel construct during 3D-printing, b) photograph of a microgel construct in the perfusion chamber directly after printing and removal of the scaffolds, c) confocal microscopy image of the permeation front of a fluorescent dye, where the high dye concentration in the micropores can be clearly seen, d) confocal microscopy image of YFP-labelled HEK-cells within a microgel construct.

Fig. 4: a) Scheme of the perfusion chamber consisting of an upstream and downstream chamber, perfusion
ports, and removable scaffolds to stabilize the microgel construct during 3D-printing, b) photograph of a
microgel construct in the perfusion chamber directly after printing and removal of the scaffolds, c)
confocal microscopy image of the permeation front of a fluorescent dye, where the high dye concentration
in the micropores can be clearly seen, d) confocal microscopy image of YFP-labelled HEK-cells within a
microgel construct.