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We demonstrate in this study that the same mouse TCR preferentially uses distinct residues of homologous peptides presented by the MHC molecules to promote specific cellular responses. The preference for distinct TCR contacts depends on neither the affinity\/avidity of TCR engagement (except in the most extreme ranges), nor the maturity of engaged T cells. Thus, different portions of the TCR ligand appear capable of biasing T cells toward specific biological responses. These findings explain differences in functional versatility of TCR ligands, as well as anomalies in the relationship between affinity\/avidity of the TCR for the peptide\/MHC and cellular responses of T cells.<\/jats:p>","DOI":"10.4049\/jimmunol.172.12.7466","type":"journal-article","created":{"date-parts":[[2014,4,22]],"date-time":"2014-04-22T00:51:09Z","timestamp":1398127869000},"page":"7466-7475","source":"Crossref","is-referenced-by-count":4,"title":["Distinct Footprints of TCR Engagement with Highly Homologous Ligands"],"prefix":"10.1093","volume":"172","author":[{"given":"Fabio R","family":"Santori","sequence":"first","affiliation":[{"name":"Michael Heidelberger Division of Immunology, Department of Pathology and New York University Cancer Center, New York University School of Medicine , New York, NY 10016"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Kaisa","family":"Holmberg","sequence":"additional","affiliation":[{"name":"Department of Immunology, The Scripps Research Institute , La Jolla, CA 92037"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"David","family":"Ostrov","sequence":"additional","affiliation":[{"name":"Department of Pathology, Immunology and Laboratory Medicine, University of Florida College of Medicine , Gainesville, FL 32610"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Nicholas R J","family":"Gascoigne","sequence":"additional","affiliation":[{"name":"Department of Immunology, The Scripps Research Institute , La Jolla, CA 92037"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Stanislav","family":"Vukmanovic\u0301","sequence":"additional","affiliation":[{"name":"Michael Heidelberger Division of Immunology, Department of Pathology and New York University Cancer Center, New York University School of Medicine , New York, NY 10016"},{"name":"Center for Cancer and Immunology Research, Children\u2019s Research Institute, Children\u2019s National Medical Center , Washington, DC 20010"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"286","published-online":{"date-parts":[[2004,6,15]]},"reference":[{"key":"2026020211254731800_R1","first-page":"255","volume-title":"Nature","year":"1999"},{"key":"2026020211254731800_R2","first-page":"616","volume-title":"Nature","year":"1996"},{"key":"2026020211254731800_R3","first-page":"1","volume-title":"Immunity","year":"1995"},{"key":"2026020211254731800_R4","first-page":"139","volume-title":"Trends Mol. 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