1A6S:
reference: Solution structure and dynamics of the bioactive retroviral M domain from Rous sarcoma virus., McDonnell JM, Fushman D, Cahill SM, Zhou W, Wolven A, Wilson CB, Nelle TD, Resh MD, Wills J, Cowburn D, J Mol Biol 1998 Jun 19;279(4):921-8. PMID: 9642071

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