Relationships among core histone gene promoter sequences. Promoter sequences are related by comparisons of cis-regulatory motif vectors, as described in the text. Individual promoters are ordered by similarity along each axis. Pair-wise correlations between promoter-specific vectors are color coded according to the scale bar shown. The block color structure along the diagonal reveals clusters of related promoter sequences.
Mariño-Ramírez et al. Genome Biology 2006 7:R122 doi:10.1186/gb-2006-7-12-r122