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The RSV F protein facilitates the fusion of the viral and host membranes. The stable form of the F protein anchors its hydrophobic N-terminus into the membrane of the target cell. The extended form of the F protein is not stable and the coils of the Heptad repeat A (blue) and Heptad repeat B (green) domains fold together. This overcomes the hydration force, to allow the viral capsid to fuse with the cell
