Microbial alliances, not mitochondria alone, may have built first eukaryotic cells

All cells in animals, plants, fungi, and protists share a fundamental characteristic: they are eukaryotic cells—complex cells with specialized internal compartments. The cells that make up our bodies are no exception.

Source: [Phys.org](https://phys.org/news/2026-06-microbial-alliances-mitochondria-built-eukaryotic.html)