“MAGNETITE, a ferrimagnetic oxide of iron is synthesized in the nanocrystalline form by many living organisms. Magnetotactic bacteria and iron reducing bacteria are naturally known to precipitate magnetite nanocrystals. Besides bacteria, unicellular algae- Euglena, dinoflagellates, as well as higher animals such as salmon, butterfly, army ants, pigeons, and even human brain mineralize magnetite nanoparticles.”
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