Researchers at the Montpellier Cancer Research Institute (IRCM) have discovered a new component in blood that has never been detected there before. Mitochondria are normally found inside cells, but the team has now discovered them floating around on their own in the bloodstream.
The discovery means that this extracellular mitochondria must be playing some kind of biological role. The team hypothesizes that it may be helping to induce immune and inflammatory responses, and helping cells communicate with each other.
https://newatlas.com/biology/unexpected-new-component-discovered-bloodstream/