3C2S:
reference: Structural characterization of a human Fc fragment engineered for lack of effector functions., Oganesyan V, Gao C, Shirinian L, Wu H, Dall'Acqua WF, Acta Crystallogr D Biol Crystallogr. 2008 Jun;64(Pt 6):700-4. Epub 2008, May 14. PMID: 18560159

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