An article published in the journal “Nature” reports a study on an archaeon called Candidatus Prometheoarchaeum syntrophicum, part of the proposed phylum Lokiarchaeota. A team of researchers took samples from the bottom of the Pacific Ocean near the Japanese coasts, managing to cultivate these Archaea contained in a special laboratory environment specifically created. Years of studies made it possible to separate various strains and to discover that some have long and branched protrusions, a feature that led the researchers to suggest that in the past a bacterium became entangled in similar protrusions becoming an organelle of what became over time a eukaryotic cell.