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Attachment glycoprotein tetramers are colored in purple (heads) and green (stalks, transmembrane, and cytoplasmic tail domains). F is highlighted in red (heads) and blue (stalks, transmembrane, and cytoplasmic tail domains). In the bi-dentate model, the conformational changes of the head are shown as slightly distinct shapes. F-triggering regions in the stalk are shown as black lines (B–D).
