Mathews F S
Biochim Biophys Acta. 1980 Apr 25;622(2):375-9. doi: 10.1016/0005-2795(80)90051-3.
The correct orientation of the heme group in cytochrome b5 has been determined by difference Fourier techniques at 2.0 A resolution. The heme orientation is now in agreement with that obtained in a recent high resolution NMR study.