1DEE:
reference: Crystal structure of a Staphylococcus aureus protein A domain complexed with the Fab fragment of a human IgM antibody: structural basis for recognition of B-cell receptors and superantigen activity., Graille M, Stura EA, Corper AL, Sutton BJ, Taussig MJ, Charbonnier JB, Silverman GJ, Proc Natl Acad Sci U S A 2000 May 9;97(10):5399-404. PMID: 10805799

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