Figure 2.

Analysis of patterns of term occurrence in abstracts. After filters have been applied to the original list, selected term-occurrence values relating to each gene are analyzed. Terms (columns) and genes (rows) were grouped on the basis of similarities between patterns of term occurrence in abstracts by hierarchical clustering. Some of the areas of the clustergram are shown in detail. Clusters are further referenced by color codes: blue, 'nuclear factors'; orange, 'receptor-ligand pair'; green, 'interferon-related'; red, 'chemokines'; violet, 'MHC class I antigen-presentation pathway'. Shades of yellow indicate different levels of term occurrence in abstracts.