Cytochrome c Cytochrome c is a small alpha-helical protein that contains one heme group. The water molecules are shown as red spheres, except one in green. The green ones are examples of water molecules that are found within the protein structure. Most of the water molecules are on the surface.Takano, T., Dickerson, R. E.: Redox conformation changes in refined tuna cytochrome c. Proc Natl Acad Sci U S A 77 pp. 6371 (1980) (Pubmed) 3cyt (PBD)
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