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Competition binding of peptides to surface-immobilized integrins. 125I-labeled echistatin was allowed to compete for binding with 5 nM (black bars) or 50 nM (grey bars) unlabeled peptides to detergent-solubilized integrin receptor subtypes αvβ3, αvβ5, α5β1, and αiibβ3. Unlabeled echistatin, which binds to all four integrins with high affinity, was used as a positive control. Error bars represent the standard deviation of measurements performed in triplicate.
