6VWI:
reference: How IGF-II Binds to the Human Type 1 Insulin-like Growth Factor Receptor., Xu Y, Kirk NS, Venugopal H, Margetts MB, Croll TI, Sandow JJ, Webb AI, Delaine CA, Forbes BE, Lawrence MC, Structure. 2020 Jul 7;28(7):786-798.e6. doi: 10.1016/j.str.2020.05.002. Epub 2020, May 26. PMID: 32459985

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