Figure 3. Scanning electron microscopic evaluation of the silk scaffold microstructure and cells state.

(A) 4 h after the iPS cells were seeded onto the scaffold; cells were seen attached to the inner surface of the scaffold. (B) 5 days after seeding, the iPSCs grew tight to each other and reached confluence with abundant fibril networks of extracellular matrix deposited on the scaffolds. Scale bar =30 μm.