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Representative microscopy images of optimized Alg-Gel microspheres (A) without hBMSCs and (B) containing 10 × 106 hBMSCs in 1 ml Alg-Gel produced using the optimized electrospray protocol; (C) plot of the microspheres circularity with or without hBMSCs; (D) influence of the hBMSCs on microsphere diameters distribution. Scale bar = 200 μm. 100 microspheres were measured in each group. hBMSCs = human bone marrow stromal cells.
