Selective loss of MCps in the intestine of CXCR2^-/- mice. (A) MCp concentrations in the intestine, lung, spleen, and BM of wild-type BALB/c mice (▪) and CXCR2^-/- mice (□) evaluated in parallel. Concentrations are expressed as MCps per 10⁶ MNCs isolated from the various tissues. Values are the mean ± SEM for 5 separate experiments, except for BM where values are the mean ± ½ range for 2 separate experiments. ^*Statistical significance, with P < .001 relative to BALB/c mice. (B) Absolute numbers of MCps per tissue for the same tissues shown in panel A.