5C1M:
reference: Structural insights into micro-opioid receptor activation., Huang W, Manglik A, Venkatakrishnan AJ, Laeremans T, Feinberg EN, Sanborn AL, Kato HE, Livingston KE, Thorsen TS, Kling RC, Granier S, Gmeiner P, Husbands SM, Traynor JR, Weis WI, Steyaert J, Dror RO, Kobilka BK, Nature. 2015 Aug 5. doi: 10.1038/nature14886. PMID: 26245379

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