Brief Overview: Hypotheses 1) arsC evolved after araA/araB since a reducing environment existed pre-dating the necessity for the reductase activity encoded by arsC. 2) ArsA, arsB and arsC should be highly conserved given their ubiquity in all three domains. 3) Non-ATP dependent AraB should be structurally different from ATP-dependent AraB. 4) The phlyogenetic relationships between ara genes should reflect the 16S rRNA phylogenies.
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