Figure 2From: Membrane-bound progesterone receptors contain a cytochrome b5-like ligand-binding domainStructure of the heme-binding domain from bovine cytochrome b5 (PDB 1cyo). The illustration has been prepared using the Rasmol program [27]. The protein is colored by secondary structure. The heme group is shown in ball-and-stick representation and the axial heme ligand histidines are shown as green side chains.Back to article page