Chronic Infection Drives Expression of the Inhibitory Receptor CD200R, and Its Ligand CD200, by Mouse and Human CD4 T Cells Caserta, Stefano ; Nausch, Norman ; Sawtell, Amy ; Drummond, Rebecca ; Barr, Tom ; MacDonald, Andrew S. ; Mutapi, Francisca ; Zamoyska, Rose Abstract Publication: PLoS ONE Pub Date: April 2012 DOI: 10.1371/journal.pone.0035466 Bibcode: 2012PLoSO...735466C