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.  Postdoc Position Available E-mail: moffat@cars.uchicago.edu Maintained by webmaster