BSCs selected from average clustering with MIPS classification showing an overview of enriched gene classes. Average methods cluster tree with the 50 top BSC clusters shown in table 1. Clusters are linked to table 1 by the ordinal numbers in table 1. Three coloured cluster groups are: blue, protein synthesis; red, energy and carbohydrate metabolism; green, cell cycle, differentiation and growth, nucleus, chromosome structure and mRNA processing. The rest of the clusters are black. Coloured groups are shown in detail in table 2 (MIPS classes). The figure is shown also as a postscript file for separate zooming and printing in figure 8 [additional file 4]. The tree is analyzed more in detail in the text.