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Figure 3.
Fig. 3. Time-dependent change in the heme iron position.
This shift is broken down into components that are perpendicular
to the heme plane (blue symbols) and components that are
parallel to the heme plane (red symbols). The change is measured
as the difference in position relative to the starting R-state
position (open diamonds) and ending T-state position (filled
diamonds). Flash photolysis causes the heme iron to move 0.4
Å perpendicular to the heme plane while shifting by only
0.15 Å parallel to the plane, away from its starting
R-state position and toward the T-state position. The heme iron
stays in this vicinity during the nanosecond time domain and
moves toward its ending T-state position in the microsecond time
domain, synchronously with other structural changes involved in
the allosteric transition shown in Fig. 2.
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