Fig. 2.

The preparation of the stem cell-laden core-shell microcapsules. a The real-time image of the microfluidic electrospray process of the microcapsules. b–e Scanning electron microscope images of the whole microcapsule (b), the interior of stem cell-encapsulated microcapsules (c), stem cells inside the microcapsules (d), and the enlarged view of the surface of microcapsules (e). The yellow arrow indicates the cells in the microcapsules. Scale bar in (b, c, and d) is 100 μm and in (e) is 10 μm