5CJQ:
reference: A stable trimeric influenza hemagglutinin stem as a broadly protective immunogen., Impagliazzo A, Milder F, Kuipers H, Wagner M, Zhu X, Hoffman RM, van Meersbergen R, Huizingh J, Wanningen P, Verspuij J, de Man M, Ding Z, Apetri A, Kukrer B, Sneekes-Vriese E, Tomkiewicz D, Laursen NS, Lee PS, Zakrzewska A, Dekking L, Tolboom J, Tettero L, van Meerten S, Yu W, Koudstaal W, Goudsmit J, Ward AB, Meijberg W, Wilson IA, Radosevic K, Science. 2015 Aug 24. pii: aac7263. PMID: 26303961

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