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Venn diagrams showing occurrence of 1,244 FSFs in the three superkingdoms. The first value in any sector reflects the occurrence of a particular FSF in any genome in that sector; values in parentheses indicate numbers found in all genomes in a sector. (A) Census based on 174 complete genomes. (B) Census based on complete genomes of 19 Archaea, 19 selected Eukarya, and 19 selected Bacteria.
