Strain specific CCL11 expression analysis in homozygous B-hCCL11 mice by ELISA. Serum was collected from wild-type mice (+/+) and homozygous B-hCCL11 mice (H/H), and analyzed by ELISA with species-specific CCL11 ELISA kit. Mouse CCL11 was detectable only in wild-type mice. Human CCL11 was detectable in homozygous B-hCCL11 mice but not in wild-type mice.