FIGURE 3. The platypus chemosensory receptor gene repertoire.
From the following article:
Genome analysis of the platypus reveals unique signatures of evolution
A list of authors and their affiliations appears at the end of the paper
Nature 453, 175-183(8 May 2008)
doi:10.1038/nature06936
a, b, The platypus genome contains only few olfactory receptor genes from olfactory receptor families that are greatly expanded among therians (three other mammals and a reptile shown), but many genes in olfactory receptor family 14 (a), and relatively numerous vomeronasal type 1 (V1R) receptors (b). These schematic phylogenetic trees show relative family sizes and pseudogene contents of different gene families (enumerated beside internal branches) and the V1R repertoire in platypus. Pie charts illustrate the proportions of intact genes (heavily shaded) versus disrupted pseudogenes (lightly shaded).
