PCR analysis of IL-18Rα in IMG. A, agarose gel electrophoresis analysis of the PCR product of female goat IL-18Rα; M, DNA marker DL5000; Line 1, β-actin; Line 2, PCR product of IL18Rα; B, phylogenetic analysis of IL-18Rα; C, the alignment of goat IL-18 Rα between Homo sapiens, Sus scrofa and Bos taurus. Goat IL-18 Rα is 91%, 88% and 87% homologous to Bos taurus, Sus scrofa and Homo sapiens, respectively.