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. Author manuscript; available in PMC: 2014 Mar 1.
Published in final edited form as: Acta Biomater. 2012 Nov 2;9(3):5590–5599. doi: 10.1016/j.actbio.2012.10.033

Figure 2.

Figure 2

Mechanical properties of ELP hydrogels and cell encapsulation viability. (A) Increasing the ratio of THPC reactive sites to primary amines in the ELP led to an increase in hydrogel elastic modulus without any changes in RGD adhesive ligand density. (B) Alternatively, the density of bioactive RGD ligands in a hydrogel was tuned without changing the hydrogel mechanical properties as shown by mass swelling ratio. (C) DRG explants after 1 day of culture stained live (green) and dead (red) indicated only a small number of dead cells in the periphery of the DRG. (D) Viability on day 1 indicated that cell survival was not affected by variations in the hydrogel RGD ligand density or hydrogel crosslink density.