Expression of the chemokines involved in macrophage migration in the livers of infected mice. Wild type (WT) and CCR5−/− (KO) mice were infected intraperitoneally with T. gondii tachyzoites. Fold expression levels for CCL2, CCL6, CCL12 and CXCL10 mRNA was determined by quantitative PCR. Bars represent the average for each experimental group (0 dpi, n = 3; 3 dpi, n = 5; 5 dpi, n = 9). RH-GFP (GFP): parasites transfected with GFP alone; RH-OE (OE): parasites transfected with TgCyp18HA and GFP.