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. 2016 Dec 23;6:39424. doi: 10.1038/srep39424

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(A) Superimposed chain A (green) and chain D (yellow). (B) Superimposed chain B (cyan) and chain C (purple). (C) Superimposed chain A (green) and chain C (purple). (D) The inter-chain hydrophobic interaction of chain A (green) and chain C (purple) indicated by black linking lines.