1I9W:
reference: The Fusion glycoprotein shell of Semliki Forest virus: an icosahedral assembly primed for fusogenic activation at endosomal pH., Lescar J, Roussel A, Wien MW, Navaza J, Fuller SD, Wengler G, Wengler G, Rey FA, Cell 2001 Apr 6;105(1):137-48. PMID: 11301009

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