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Brazilian scientists have discovered that the strong odor released by some amphibian species is produced by bacteria and that attracting a mate is one of its purposes. The bacteria in question are a noteworthy example of symbiosis as they assist in the animal's mating process. A paper recounting the discovery of this role of microorganisms isolated from the skin of frogs has been published in the journal Proceedings of the National Academy of Sciences (PNAS). "Frogs emit a pungent odor. [...]