[ CO-myoglobin nanosecond time-resolved crystallography ]
Difference Fourier maps of carbonmonoxy myoglobin at room temperature reveal photolysis of the carbon monoxide ligand (red, negative difference density) from the heme iron 4 nanoseconds after a myoglobin crystal receives a laser pulse.  Subsequent loss of this negative difference feature at 1 microsecond and 350 microseconds indicates ligand rebinding to heme. 

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