4JDZ:
reference: Structures of SdrD from Staphylococcus aureus reveal the molecular mechanism of how the cell surface receptors recognize their ligands., Wang X, Ge J, Liu B, Hu Y, Yang M, Protein Cell. 2013 Apr;4(4):277-85. doi: 10.1007/s13238-013-3009-x. Epub 2013 Apr, 3. PMID: 23549613

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