versal genes have either undergone lateral transfer in the pastor have diverged so much in sequence that their distant past could not be resolved.
The nature of the conserved genes suggests innovations that may have been essential to the divergence of the three domains of life. The analysis also identified several genes of unknown function with phylogenies that track with the ribosomal RNA genes. The products of these genes are likely to play fundamental roles in cellular processes" -- Reference http://www.genome.org/cgi/content/abstract/GR-6528v1?etoc
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