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Peptide RGWRGEKIGN binds to heparan sulfate. A, different concentrations of heparan sulfate were added to RGWRGEKIGN, and fluorescence emission of the single tryptophan residue in the peptide was measured. B, emission spectra of 0.5 μm peptide RGWRGEKIGN alone (○) or with 20 μm (■) or 40 μm heparan sulfate (△).
