Fig. 2.

Human microvascular network formation based on microfluidic 3D HUVEC culture. a Schematic diagram of HUVECs seeding in the fibrin hydrogel. b Schematic diagram of microvascular network formation in the fibrin hydrogel. c Microscope image of HUVECs just seeding in fibrin hydrogel. d Confocal microscope image of human microvascular networks