Single-cell suspensions were prepared from perfused lungs or blood samples as described previously (Qian et al., 2011 (link)). After blocking with anti–mouse CD16/CD32 antibody (BD), the cells were stained with DAPI and fluorescent antibodies to following antigens; CD45 (30-F11), F4/80 (BM8), CD11b (M1/70), Ly6C (HK1.4), Gr1 (RB6-8C5), CD115 (AFS98), CD3 (17A2), NK1.1 (PK136; all from BioLegend); CD4 (GK1.5), B2.20 (RA3-6B2), Ly6G (1A8), CD11c (HL3; all from BD); CD8a (53–6.7), CCR5 (7A4; both from eBioscience); CCR1 (643854), CCR2 (475301; both from R&D Systems). Flow cytometry was performed using LSRII cytometer (BD) and analyzed using FlowJo software (Tree Star). In some experiments, the stained cells were sorted using FACSAria II (BD).