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(A) Micrographs of HUVECs within agarose–gelatin–fibrinogen microcapsules at Day 0 and after their release. On Day 1, released HUVECs are seen attached and spread after their release onto gelatin-coated tissue culture plastic. By Day 2, several cells have migrated and have aligned themselves into a cord-like structure that is typical of HUVEC in vitro tubulogenesis behavior [27]. (B) Non-encapsulated HUVEVs control.
