2NSU:
reference: Asymmetric binding of transferrin receptor to parvovirus capsids., Hafenstein S, Palermo LM, Kostyuchenko VA, Xiao C, Morais MC, Nelson CD, Bowman VD, Battisti AJ, Chipman PR, Parrish CR, Rossmann MG, Proc Natl Acad Sci U S A. 2007 Apr 17;104(16):6585-9. Epub 2007 Apr 9. PMID: 17420467

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