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Structural environment of Tyr residues in FnIII-3 and FnIII-4. (a, b) Close-up of FnIII-3 around Y1494 and Y1526 in stick (a) and surface (b) representation coloured by the electrostatic potential on the surface from −3kT/e (red) to 3kT/e (blue). (c, d) Close-up of Y1642 in the FnIII-4 in stick (c) and surface (d) representation coloured by electrostatic potential as in (b).
