Figure 1.

In vivo cylinder-shaped sample (8 × 6 mm) (A) and microstructural image of a liquid nitrogen frozen/freeze-dried gel observed under a field emission scanning electron microscope (B; bar = 1μm). Comparison of the mechanical properties of the silk and collagen gels using strain-to-failure and stress-relaxation tests. C) For each experiment, four samples were tested. Error bars represent the SD.