Comparison of unreduced and reduced representations of a concatenated supermatrix. Taxa are represented in rows and genes in columns. If a gene has not been identified or sequenced in a taxon, this entry is left white in the matrix, blue entries indicate the presence of gene sequences for that taxon. Shades of blue correspond to information content of the specific gene. Dark blue represents high information content and light blue low information content. The representation of the original supermatrix is placed in the upper panel. Columns are sorted according to their information content. The reduced supermatrix in the lower panel was generated with the software maremare and represents an optimal selection of taxa and genes from the original supermatrix according to the criteria developed in this maremare approach.