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We have used the pH-induced self-assembly of a peptide-amphiphile to make a nanostructured fibrous scaffold reminiscent of extracellular matrix. The design of this peptide-amphiphile allows the nanofibers to be reversibly cross-linked to enhance or decrease their structural integrity. After cross-linking, the fibers are able to direct mineralization of hydroxyapatite to form a composite material in which the crystallographic c axes of hydroxyapatite are aligned with the long axes of the fibers. This alignment is the same as that observed between collagen fibrils and hydroxyapatite crystals in bone.
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Jeffrey D. Hartgerink
Elia Beniash
Samuel I. Stupp
Science
Northwestern University
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Hartgerink et al. (Fri,) studied this question.
www.synapsesocial.com/papers/69dc53805e1d727a1a27493e — DOI: https://doi.org/10.1126/science.1063187