Unsupervised hierarchical clustering.

<p>Heat map including all samples from 4 healthy controls (light blue) and 5 HCV-positive subjects (light red). Red indicates over-expression; green indicates under-expression; black indicates unchanged expression; gray indicates no detection of expression. Each row represents a single gene; each column represents a single sample. The dendrogram at the left of matrix indicates the degree of similarity among the genes examined by expression patterns. The dendrogram at the top of the matrix indicates the degree of similarity between samples.