Sulfolobus islandicus plasmids pRN1 and pRN2 share distant but common evolutionary ancestry - Keeling, P. J.; Klenk, H.-P.; Singh, Rama K.; Schenk, Margret E.; Sensen, Christoph W.; Zillig, Wolfram; Doolittle, W. Ford (Springer, 1998)
http://dx.doi.org/10.1007/s007920050083
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