1GP9:
reference: A new crystal form of the NK1 splice variant of HGF/SF demonstrates extensive hinge movement and suggests that the NK1 dimer originates by domain swapping., Watanabe K, Chirgadze DY, Lietha D, de Jonge H, Blundell TL, Gherardi E, J Mol Biol 2002 May 31;319(2):283-8. PMID: 12051906

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