The present invention relates to blood-derived luterial and a method for isolating and culturing the same. The luterial according to the present invention is a cell or cell-like structure having the following characteristics: (1) it is present in body fluids, including blood, sperm, intestinal juices, saliva, and cellular fluids； (2) it shows a positive staining with Janus green B, Acridine Orange and Rhodamine 123 in an immunofluorescence test； (3) in an optimal environment (pH 7.2-7.4), it has the property of expressing the genes homologous to beta-proteobacteria and gamma-proteobacteria, and has a size of 30-800 nm； (4) in an acidic environment, it has the property of expressing not only the genes homologous to beta-proteobacteria and gamma-proteobacteria, but also eukaryote-derived genes (particularly Streptophyta gene), and grows to a size ranging from 400 nm or more to 2000 nm or more； (5) it is involved in ATP production under normal conditions； and (6) it differs from mitochondria, completely differs from exosomes, and has fusion characteristics corresponding to those of an intermediary between a prokaryote and an eukaryote.
