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Orientation of complexes. (A) Cyt f-PC complexes. (B) Cyt f-cyt c6 complexes. (C) K189A-cyt f-PC complexes. (D) K189E-cyt f-PC complexes. (E) Wild-type cyt f at 300 mM ionic strength. Five complexes were chosen for each condition and were superimposed using GRASP. The protein backbones, the cyt f heme and the PC Cu atoms are shown. The ionic strength is 10 mM except where indicated.
