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. 2011 May 27;6(5):e20361. doi: 10.1371/journal.pone.0020361

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Gottlieb et al.

This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are properly credited.

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Distribution of different aaRS families according to the CP origins: appearing in all 3 kingdoms, only in Eukarya, only in Archaea, Archaea and Eukarya together, and only in Bacteria.