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An engineered lipocalin specific for CTLA-4 reveals a combining site with structural and conformational features similar to antibodies.
Schönfeld D, Matschiner G, Chatwell L, Trentmann S, Gille H, Hülsmeyer M, Brown N, Kaye PM, Schlehuber S, Hohlbaum AM, Skerra A. Schönfeld D, et al. Among authors: chatwell l. Proc Natl Acad Sci U S A. 2009 May 19;106(20):8198-203. doi: 10.1073/pnas.0813399106. Epub 2009 May 5. Proc Natl Acad Sci U S A. 2009. PMID: 19416843 Free PMC article.