2PF5:
reference: Plasticity of the TSG-6 HA-binding loop and mobility in the TSG-6-HA complex revealed by NMR and X-ray crystallography., Higman VA, Blundell CD, Mahoney DJ, Redfield C, Noble ME, Day AJ, J Mol Biol. 2007 Aug 17;371(3):669-84. Epub 2007 Jun 2. PMID: 17585936

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