5ZBH:
reference: Structural basis of ligand binding modes at the neuropeptide Y Y1 receptor., Yang Z, Han S, Keller M, Kaiser A, Bender BJ, Bosse M, Burkert K, Kogler LM, Wifling D, Bernhardt G, Plank N, Littmann T, Schmidt P, Yi C, Li B, Ye S, Zhang R, Xu B, Larhammar D, Stevens RC, Huster D, Meiler J, Zhao Q, Beck-Sickinger AG, Buschauer A, Wu B, Nature. 2018 Apr;556(7702):520-524. doi: 10.1038/s41586-018-0046-x. Epub 2018 Apr, 18. PMID: 29670288

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