Strain specific IL18BP expression analysis in homozygous B-hIL18BP mice by ELISA. Serum was collected from wild-type mice (+/+) and homozygous B-hIL18BP mice (H/H) and analyzed by ELISA with species-specific IL18BP ELISA kit. Mouse IL18BP was detectable in wild-type mice. Human IL18BP was exclusively detectable in homozygous B-hIL18BP mice but not in wild-type mice.