Figure 2. Structure of human Np17 and evolutionary relationships of Np17 genes. (A) Np17 gene contains 7 exons, in which exons 1-4 are noncoding exons, and exons 5-7 encode Np17 protein. (B) Phylogenetic tree based on Np17 protein showing the clustering of Np17 genes in Hominoidea, including Human, Chimpanzee (Pan troglodytes), and Gorilla.