Figure 3.

(A) Phylogenetic tree of exon sequences from cat, human, and rat Zfx and Zfy genes. The tree is derived from minimum-evolution using neighbor-joining derived from an exhaustive search using Kimura 2P model. Branch lengths are % sequence divergence. (B) Phylogenetic tree of adjacent 5′ intron of Zfy and Zfx from cat, human, and rat. Shown is the minimum evolution-neighbor joining tree derived from an exhaustive search of all possible trees based on the Tajima-Nei model of substitution. Numbers on branches represent % sequence divergence.