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. 2017 Nov 7;21:24. doi: 10.1186/s40824-017-0110-x

Fig. 1.

Fig. 1

a, b A schematic of the pyrrole group conjugation to the carboxylic acid groups of alginate with varied degrees of pyrrole substitution using carbodiimide chemistry. c Alginate-g-pyrrole hydrogels formed containing a high and low degree of conjugated pyrrole to alginate. d Images of gels formed with varied concentrations of pyrrole substitution to alginate