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The dimer interface for the influenza A/Udorn/72 NS1A effector domain. (a) A space-filling model of monomer subunit A reveals a distinct largely hydrophobic pocket that has evolved to bind aromatic residues from the F2F3 domain of CPSF30. Here, Trp187 from effector domain monomer subunit B (shown in blue) binds in that pocket. (b) A detailed view of the interactions of Trp187 with monomer subunit A binding-cleft residues (shown in green).
