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Fridkis-Hareli, Masha and Reche, Pedro A and Reinherz, Ellis L (2004) Peptide variants of viral CTL epitopes mediate positive selection and emigration of Ag-specific thymocytes in vivo. Journal of Immunology (Baltimore, Md. : 1950), 173 (2). pp. 1140-50. ISSN 0022-1767