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Conserved regions between the fusion protein from influenza and ISA viruses. The figure shows a multialignment between most diverse members of the pfam00509 family and fusion proteins from ISAV. The shaded background indicates the conserved residues. The horizontal black bars show the putative proteolytic site (M1), the transmembrane of ISAV fusion protein (M2), and the coiled-coil (M3) regions.
