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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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Scheme of hydrogen bonds, NH(Lys32)-O(C7), NH(Lys39)-O(T8) and NH(Lys40)-O(A9), at Smad1-DNA interfaces for Smad4+DNA+Smad1 (light pink) and Smad1+DNA+Smad1 (light blue) models with oxygen atoms of DNA phosphate backbone in red, hydrogen atoms in white, nitrogen atoms in blue and carbon atoms in magenta for Smad4+DNA+Smad1 model, carbon/nitrogen atoms in blue for Smad1+DNA+Smad1 model.