This entry represents a multihaem-binding domain found in the cytochrome subunit of the photosynthetic reaction centre (PRC), and other cytochrome proteins [<cite idref="PUB00037407"/>, <cite idref="PUB00014116"/>]. This domain is predominantly alpha-helical and, in the PRC cytochrome subunit, binds two haem groups. Multihaem cytochrome, photosynthetic reaction centre cytochrome subunit-like