Heat map and unsupervised Hierarchical Clustering.

<p>The clustering is performed on all samples and on all microRNAs with standard deviation over 1. Each row represents one microRNA and each column represents one sample. The microRNA clustering tree is shown on the left. The color scale shown at the bottom illustrates the relative expression level of a microRNA across all samples: red color represents an expression level above mean, green color represents expression level lower than the mean.