Additional file 6.

PCA plots of a combined human and mouse gene expression data matrix normalized by sample. The samples are labeled by (a) species and (b) tissue type. Mouse samples (black) and human samples (red) are well separated on the axis of component 1. Tissue clusters in the two species are projected to the second principal component in a similar order: nervous system (blue), muscle/heart (red), liver (purple) and cell lines (green).

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