| http://www.w3.org/ns/prov#value | - wherein each X is a peptide chain that (i) has a minimum of three amino acid residues, (ii) has a maximum of about fifty amino acid residues, and (iii) binds a heparin-binding growth factor receptor (HBGFR); R1 is a single trifunctional amino acid residue covalently bonded to each X; each R2 is independently a linker comprising a chain from 0 to about 20 backbone atoms including carbon, oxygen, su
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