CCR3 and infection: Three main CCR3neg cell populations were identified using Ly6C in combination with the F4-80 marker and CCR3 to exclude F4-80pos eosinophils: F4-80high Ly6Cneg (R1), considered to be resident peritoneal macrophages in the early steps of the infection; F4-80low Ly6Chigh (R2), considered to be recruited inflammatory monocytes; and F4-80neg, Ly6Clow, considered to be PMNs (R3) (Figure 6A, Supplementary Figure 6).