Michael D. Gunn is in the Departments of Medicine and Immunology and Garnett Kelsoe is in the Department of Immunology, Duke University Medical Center, Durham, North Carolina 27710, USA. michael.gunn@duke.edu
For lymphocytes to function properly, they must move to and recognize precise anatomical locations. To do so, lymphocytes must decipher cues from a panoply of competing traffic signals.
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