CD200R1 and infection: Elicited macrophages from both CD200R1+/+ and CD200R1−/− mice were infected with HSV-1 (multiplicity of infection; MOI = 10), or challenged with Pam2CSK4 (100 ng/ml), or LPS (100 ng/ml), and levels of IL-6, CCL5 (Rantes), or CCL2 (MCP-1) were measured at 24, 48, and 72 h.