3N94:
reference: Crystal Structure of the PAC1R Extracellular Domain Unifies a Consensus Fold for Hormone Recognition by Class B G-Protein Coupled Receptors., Kumar S, Pioszak A, Zhang C, Swaminathan K, Xu HE, PLoS One. 2011;6(5):e19682. Epub 2011 May 19. PMID: 21625560

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