Additional file 4.
PCA plot of a combined human and mouse gene expression data matrix (principal components 1 and 2). The samples are labeled by (a) species and (b) tissue type. Four major sample clusters are indicated: muscle/heart samples (red), nervous system samples (blue), liver samples (purple) and cell line samples (green). For these clusters, human and mouse samples exhibit subclustering in proximity to each other.
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Zheng-Bradley et al. Genome Biology 2010 11:R124 doi:10.1186/gb-2010-11-12-r124