Algorithms|Base Sequence|Cluster Analysis|Computational Biology|Escherichia coli|Gene Expression Regulation|Genome|Genomics|Halobacterium|Helicobacter pylori|Molecular Sequence Data|Oligonucleotide Array Sequence Analysis|Pattern Recognition, Automated|Promoter Regions, Genetic|Saccharomyces cerevisiae|Sequence Alignment|Species Specificity