Free-standing polypeptide films are formed by a novel cross-linking pathway involving cross-chain terminations of polypeptide chains grown from multifunctional initiators. Greg G. Qiao, Frank Caruso, and co-workers describe on page 4619 how this fabrication method provides a facile approach towards the formation of stable cross-linked polypeptide capsules with tunable thickness, compositions, and enzymatic degradability.
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