5YQZ:
reference: Structure of the glucagon receptor in complex with a glucagon analogue., Zhang H, Qiao A, Yang L, Van Eps N, Frederiksen KS, Yang D, Dai A, Cai X, Zhang H, Yi C, Cao C, He L, Yang H, Lau J, Ernst OP, Hanson MA, Stevens RC, Wang MW, Reedtz-Runge S, Jiang H, Zhao Q, Wu B, Nature. 2018 Jan 3;553(7686):106-110. doi: 10.1038/nature25153. PMID: 29300013

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