We also analyzed three bacterial species Escherichia coli K12 MG1655 , the cyanobacterium Synechococcus elongatus PCC 7942 , and the alphaproteobacterium Rickettsiales bacterium Ac37b  and three Archaea species Ignicoccus hospitalis kin4/i, Nanoarchaeum equitans
, and Lokiarchaeum sp.
For instance, Nanoarchaeum equitans
lacks most of the genes for metabolic and biosynthesis process [12, 26].
Ki et al., "Unique substrate spectrum and PCR application of Nanoarchaeum equitans
family B DNA polymerase," Applied and Environmental Microbiology, vol.
Because Ignicoccus is Latin for "fireball," Stetter named its microbial partner Nanoarchaeum equitans
to indicate a dwarfarchaeum riding a fiery sphere.
Professor Karl Stetter, who has spent more than 20 years looking for the bug, has named it Nanoarchaeum equitans
. He said: "The microbe could harbour clues to what makes a living organism."