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. 2013 Jan 10;8(1):e53841. doi: 10.1371/journal.pone.0053841

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© 2013 Wang 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 occupancies of hydrogen bonds at Smad1-DNA interfaces in Smad4+DNA+Smad1 (magenta) and Smad1+DNA+Smad1 (blue) models on the left, respectively; and the occupancies of hydrogen bonds at Smad4-DNA interface in the Smad4+DNA+Smad1 model (magenta) and at Smad1-DNA interface in the Smad1+DNA+Smad1 model (blue) on the right, respectively.