Figure 3.

Mechanical evaluation of gelatin, glutaraldehyde-crosslinked gelatin, GT2M, and GT4M hydrogels (A). Representative compressive strain-stress curves (B), load and unload compressive curves (C), and compressive image of different hydrogels (D). Representative stretch strain-stress curves (E), the summary of stretch modulus (F), and (G) stretch image of different hydrogels. (H) Rheological properties of GT4M hydrogel under different strain. (I) The inner section of different hydrogels and manganese ion distribution in GT4M hydrogel (inserted Figure), scale bar = 100 μm.