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. 2013 Jul 15;8(7):e68373. doi: 10.1371/journal.pone.0068373

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© 2013 Bertin 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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A: Colony morphology of PG1^T opaque (OP) and translucent (TR) colony variants grown on PPLO supplemented agar with (right) or without (left) Congo red. Magnification: x30. B: Electron microscopy of Ruthenium red-stained PG1^T OP and TR colonies. CM: cytoplasmic membrane.