Figure 15.16: Structure of the redox components of
complex III-cytochrome b, the iron-sulfur protein (ISP),
and the heme of cytochrome c1.
Courtesy of J. Deisenhofer from H. Kim, D. Xia, and J. Deisenhofer,
Proc. Natl. Acad. Sci. (1995) 95:8026-8033, with permission
of PNAS.