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Distribution of transcriptional regulators in eukaryotic organisms (A. thaliana, D. melanogaster, C. elegans, and S. cerevisiae). Transcriptional regulators are kingdom-specific, common to plants, animals, and fungi, or present in only two of the three kingdoms. Members of kingdom-specific families represent only 14% of the total in Drosophila because of its extensive use of the C2H2 zinc finger proteins. The data represented in this figure are from Riechmann et al. (2000).
