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hMSCs on silk scaffold. (A) hMSCs (green) sparsely seeded onto a silk scaffold, stained with calcein AM. Silk (red) is counter stained with ethidium homodimer (10× objective, bar = 300 μm, stack 1500 × 1500 × 630 μm). (B) Thickly seeded GFP-expressing hMSCs (green) on silk scaffold (red) (20× objective, bar = 75 μm, stack 750 × 750 × 210 μm).
