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Tetramer-to-dimer ratios in three stalk segments shown as helical wheels. Residue number and identity are indicated. The color of each circle denotes the fusion score; red (0), orange (1), blue (2), and green (3). The length of the line next to the circle is proportional to the tetramer:dimer ratio. A, central segment. B, intermediate segment. C, head-proximal segment.
