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Top, scanning electron micrographs of unmineralized gels of (a) reconstituted collagen, (b) alginate, and (c) peptide amphiphile nanofibers, alginate. All gels were critical point dried to preserve their three-dimensional structure. Bottom, photographs comparing mineral formation after 14 days in a collagen gel, an alginate gel, and a peptide amphiphile gel. The coarse white mineral visible in the PA gel was not observed in collagen or alginate gels.
