1G5G:
reference: The structure of the fusion glycoprotein of Newcastle disease virus suggests a novel paradigm for the molecular mechanism of membrane fusion., Chen L, Gorman JJ, McKimm-Breschkin J, Lawrence LJ, Tulloch PA, Smith BJ, Colman PM, Lawrence MC, Structure (Camb) 2001 Mar 7;9(3):255-66. PMID: 11286892

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