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. 2016 Jul 6;6:29502. doi: 10.1038/srep29502

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Copyright © 2016, Macmillan Publishers Limited

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(A) The free-energy landscape of α9 dimer transition between the intersected (I) and parallel (VI) conformational states, which are connected by the II–V states. The rotation angles (α, β) of the monomer backbones around the principal helical axes in state I are the collective variables. The free-energy minimum is set to be zero. (B) The minimum energy pathway connected by circles in (A) with states I and VI labeled and shown in a cartoon representation. Residues I175 and L185 are highlighted by red and green spheres.