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Three-dimensional illustration of gene expressions from M26383, R15447, and M28214, along with tissue types. The 40 points from cancer tissues are labeled in red and the 22 points from normal tissues in green. Because cancer tissues end up in two terminal nodes in Fig. 1 and so are normal tissues, two levels of intensities for each of the red and green colors are highlighted to indicate different terminal node assignments of the same type of tissues.
