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(A) Prefusion S2 subunit structure of the Spike protein. (B) Postfusion S2 subunit structure of the Spike protein. (C) Sequence range of the Head Group (HG), Fusion Peptide (FP), Connecting Region (CR), Heptad Repeat 1 (HR1), Linker Region (LR), Heptad Repeat 2 (HR2), and Transmembrane Region (TM).
