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a) Schematic of bilayer self-folding hydrogel with different cell populations encapsulated in different layers. b) Fluorescent image of self-folding hydrogel with an inner layer encapsulating blue Hoeschst-stained fibroblasts and with an outer layer encapsulating green calcein AM-stained fibroblasts. Length of hydrogel = 4 mm. Reproduced with permission.[44] 2014, John Wiley and Sons.
