Figure 4. Phylogenetic tree for several CIB4 genes in 9 species. The sheep CIB4 gene nucleotide sequence was aligned with other homologous CIB4 genes. The plylogenetic tree was constructed by neighbor-joining method using MEGA4.1 software. The GenBank accession No. of CIB4 gene are Ovis aries (FJ039532), Capra hircus (NC_022313), Bos Taurus (AC_000178.1), Camelus bactrianus (XM_010972084.1), Physeter catodon (XM_007108419.1), Canis lupus familiaris (XM_003432152.2), Equus caballus (XM_001502860.3), Homo sapiens (NC_000002.12) and Mus musculus (BC118938.1).