AUTHOR=Handel Tracy Marie TITLE=The Structure of a CXCR4:Chemokine Complex JOURNAL=Frontiers in Immunology VOLUME=6 YEAR=2015 URL=https://www.frontiersin.org/journals/immunology/articles/10.3389/fimmu.2015.00282 DOI=10.3389/fimmu.2015.00282 ISSN=1664-3224