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. 2013 Oct 7;8(10):e76914. doi: 10.1371/journal.pone.0076914

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© 2013 Yan 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 wild-type strain Guy11, WH672, Δmet13 (K56) and Δmet12 (K12-7) were grown on MM medium at 25°C for 10 days. Concentrations of methionine, homocysteine or ammonium sulfate are as indicated.