Additional file 1.

PCA plot of the integrated mouse gene expression data matrix. The two axes are components 2 and 3; each dot represents a sample, colored by experiment accession number. While experiments with more than 15 samples are labeled as individual experiments, experiments with smaller numbers of samples are grouped into one category, 'small exp' (light brown). Tissue clusters observed in Figure 1 are circled. No apparent clustering of samples based on experiments is observed.

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