Living organisms exist in various systems of balanced symbiotic relationships. Lichen is an example of a symbiotic organism. It grows in a symbiotic relationship with local micro-organisms. The mycorrhizal fungus Glomus intraradices increases uranium content in the roots of its symbiotic plant. Bacteria also live in symbiotic and parasitic relationships with plants and animals. Traces of fungi have also been observed which suggests potential for unique symbiotic interactions. Animals and plants in a mutually symbiotic arrangement with ants are called Myrmecophiles. They evolved from symbiotic bacteria and retain a remnant genome. The eukaryotic cell seems to have evolved from a symbiotic community of prokaryotic cells. Some species of chewing lice house symbiotic bacteria in bacteriocytes in their bodies. Cellulose is digested with the aid of symbiotic bacteria. Chloroplasts produce energy from light by photosynthesis, and were also originally symbiotic bacteria. There are no thylakoid membranes invading the pyrenoid, which is unlike other symbiotic dinoflagellates. Mitochondria are thought to be reduced descendants of symbiotic bacteria that were once free living. These interaction range from pathogenic to symbiotic and symptomatic to asymptomatic.