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Alan Dove

I'll be quite surprised if we don't find a similar phenomenon in even older branches of the tree of life, particularly marine organisms. Everything from sponges to shrimp has to survive in a bath of bacteria and protozoa.

You are so right. A good example are sponges. For an example of work in Australia, see http://www.abc.net.au/science/news/health/HealthRepublish_195275.htm

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