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. 2018 Jun 21;10(7):690. doi: 10.3390/polym10070690

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© 2018 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

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Nano- and microstructure of hydrogels (top panel TEM images and bottom panel AFM images). (a,e) Fmoc-FRGDF; (b,f) Fmoc-PHSRN; (c,g) Fmoc-FRGDFPHSRN and (d,h) peptide mixture of Fmoc-FRGDF/Fmoc-PHSRN (1:1, w/w).