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. 2011 Jun 27;6(6):e21053. doi: 10.1371/journal.pone.0021053

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Talavera 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. Contacts in homocomplexes. B. Contacts in heterocomplexes. Blue, fraction of main-chain to main-chain contacts. Red, fraction of main-chain to side-chain contact. Green, fraction of side-chain to side-chain contact.1.