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Schematic of a paramyxovirus F protein and identification of CBF1. FP = fusion peptide; HRA/B = heptad repeat A/B; TM = transmembrane domain; residues in black = completely conserved amino acids; residues in dark grey = conserved across most members; residues in light grey = similar amino acids; residues underlined = mutations made to alanine within SV5 F and HeV F.
