Chlamydiae expand our view on how intracellular bacteria evolve

All chlamydiae today live inside the cells of hosts ranging from amoeba to animals. A team of scientists found that the ancestor of chlamydiae likely already lived inside host cells, but that chlamydiae infecting amoeba evolved later in ways unexpected for intracellular bacteria. The study is an important step for understanding the emergence and evolution of endosymbiotic bacteria, including human pathogens.

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