Figure 6.

Average pairwise percent identities of milk and mammary genes across mammals. The distribution of average amino acid pairwise PID of amino acid sequences across the seven taxa - human, mouse, rat, bovine, dog, opossum, and platypus - is plotted for those genes in the virgin, pregnancy, lactation, involution, and mastitis mammary gene sets, the milk protein gene set, and all bovine consensus genes. Only genes with a single copy in each of the seven genomes were used for the analysis. Milk and mammary genes are more conserved across mammals than other genes in the genome.

Lemay et al. Genome Biology 2009 10:R43   doi:10.1186/gb-2009-10-4-r43
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