AUTHOR=Nagasawa Takashi TITLE=CXCL12/SDF-1 and CXCR4 JOURNAL=Frontiers in Immunology VOLUME=6 YEAR=2015 URL=https://www.frontiersin.org/journals/immunology/articles/10.3389/fimmu.2015.00301 DOI=10.3389/fimmu.2015.00301 ISSN=1664-3224