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Who's calling? over the counter meds similar to viagra Some of the sequences come from bacterial groups that were first identified at deep-sea hydrothermal vents. Those are powered by volcanic activity, and the authors note that Vostok fills a rift valley, which might allow similar structures to form in the lake itself. Alternately, the bacteria could be living in water that seeps into hot areas under the lake bottom and sporadically get ejected into the lake itself.

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