Sponge bacteria, a chemical factory

Sponges are unique beings: they are invertebrates that live in symbiosis with sometimes hundreds of different types of bacteria; similar to lichens which are a biocoenosis of algae and fungi. "Put simply, many sponges are lumps of bacteria in which some sponge cells are found," says Jörn Piel, Professor of Microbiology at the ETH Zurich.

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