CMKLR1 and asthma: To test this hypothesis, phenotypic features of asthma were assessed in wild‐type mice and mice homozygous for a null mutation in the gene encoding Cmklr1 (CMKLR1‐deficient mice) 4 and/or 24 h following cessation of a 3‐h acute inhalation exposure to either filtered room air (air) or O3.