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. 2010 Aug 5;5(8):e11988. doi: 10.1371/journal.pone.0011988

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Gherardini 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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The proteins involved are Serine racemase from Schizosaccharomyces pombe (2zpu, left) and Argininosuccinate synthetase from Thermus thermophilus (1kor, right).