5U52:
reference: 3-2-1: Structural insights from stepwise shrinkage of a three-helix Fc-binding domain to a single helix., Ultsch M, Braisted A, Maun HR, Eigenbrot C, Protein Eng Des Sel. 2017 May 5:1-7. doi: 10.1093/protein/gzx029. PMID: 28475752

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