AUTHOR=Immunology Editorial Office Frontiers i. TITLE=Expression of concern "Co-receptor CD8-mediated modulation of T-cell receptor functional sensitivity and epitope recognition degeneracy" JOURNAL=Frontiers in Immunology VOLUME=5 YEAR=2014 URL=https://www.frontiersin.org/journals/immunology/articles/10.3389/fimmu.2014.00401 DOI=10.3389/fimmu.2014.00401 ISSN=1664-3224