The present invention relates to a polypeptide monobody which includes a modified acid sequence and renders the polypeptide monobody able to bind selectively to .alpha..nu..beta.3 integrin. Fusion proteins and conjugates which include the polypeptide monobody, as well as compositions containing the polypeptide monobody, fusion proteins, or conjugates are also disclosed. Uses thereof include: treating or preventing an .alpha..nu..beta.3 integrin-mediated disease or disorder, inhibiting .alpha..nu..beta.3 integrin activity, treating a cancerous or precancerous condition, imaging tissues using positron emission tomography or magnetic resonance imaging, assessing the metastatic characteristics of a tumor, and delivering DNA to a cell.

 
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