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[http://en.wikipedia.org/wiki/Cytochrome Cytochromes] are a class of heme-containing proteins that are generally membrane-bound. They are soluble proteins<ref name=main /> found in bacteria and the mitochondria of eukaryotic organisms, and are known as respiratory pigments because they are involved in electron transfer in various electron transport chains.<ref name="heme">PMID:14871137</ref> Cytochromes can be categorized into three different types, all based on the type of prosthetic heme group the cytochrome contains. Cytochrome ''c'' is named such because it contains the heme ''c'', which is distinguished from hemes ''a'', ''b'', and ''d'' by its coordination to the protein scaffold by cysteinyl residues.<ref name=heme />  

Cyt ''c'' has been split into four classes<ref name=”amb”>PMID:1646017</ref>, Class I containing single domain C-type cytochromes of which there has been at least six classes found in prokaryotes such as [http://en.wikipedia.org/wiki/Desulfovibrio ''Desulfovibrio desulfuricans''], [http://en.wikipedia.org/wiki/Rhodospirillum_rubrum ''Rhodospirillum rubrum''], and ''Rhodothermus marinus''.