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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 visual superpositions for average structures of Smad4+DNA+Smad1 (light blue) and Smad1+DNA+Smad1 (light pink) models as viewed orthogonal (A) and parallel (B) to DNA axis. Selected helices shown in cartoon form with the remaining part colored in white semi-transparent surface.