Additional file 5.

PCA plots of a combined human and mouse gene expression data matrix with all samples. The samples are labeled by (a) species and (b) tissue type. Unlike previous PCA plots, samples such as mammary gland and hematopoietic system whose presentation is mostly one-sided in one species were removed from the analysis; this PCA included all high quality data from both human and mouse. The clustering of samples from nervous system (green), muscle/heart (lilac), cell lines (brown), and liver (pink) is still evident among the overwhelmingly dominant hematopoietic samples (blue) and mammary gland samples (turquoise). The corresponding human and mouse sample clusters resemble each other. Samples of unknown tissue type annotation are colored white and labeled as '0'.

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Zheng-Bradley et al. Genome Biology 2010 11:R124   doi:10.1186/gb-2010-11-12-r124