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. 2011 Jun 28;6(6):e21683. doi: 10.1371/journal.pone.0021683

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Gao, Zhang.

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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Significantly enriched third enzyme types of (A) EC 6.1.1: ligases forming aminoacyl-tRNA (B) EC 2.7.7: nucleotidyltransferases (C) EC 2.7.4: phosphotransferases with a phosphate group as acceptor, in essential genes.