| http://www.w3.org/ns/prov#value | - A method of prommoting cell attachment to a substrate, comprising the steps of:immobilizing on the substrate a composition of matter comprising a substantially pure polypeptide X-Arg-Gly-Asp-R-Y wherein X is H or at least one amino acid and Y is OH or at least one amino acid, and R is an amino acid selected from Ser, Syc, Thr or other amino acid, said peptide having cell attachment promoting activ
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