Figure 2.

Expression profile of human OR genes across tissues. The log transformed detection P values for OR genes in all tissues (from Additional data file 1) were standardized to have mean 0 and standard deviation 1 and are color coded (red and blue shades indicate values above and below the mean, respectively). The dendrograms on top of each panel illustrate the clustering (by hierarchical clustering in dchip [48]) of tissue samples based on the profile of OR gene expression. (a) All 578 predicted OR genes are included in a comparison between olfactory epithelium (OE) and the non-olfactory tissues (see Materials and methods). (b) Shown are the data for only the 147 OR genes with significantly elevated expression in non-olfactory tissues.