Spread of samples for the bladder cancer data set using normalized expression values. The first two principal components (PC) of the normalized data are shown for the collective of all samples (A and C) and the collective of tumor samples (B and D) using normalized miRNA (A and B) or mRNA (C and D) expression data, respectively. Circles refer to samples of the control group, triangles are samples
... [Show full abstract] revealed invasive tumors and crosses refer to samples with non-invasive tumors.
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