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A Symbiont Betrays Its Host

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It came as a surprise to me recently to realize how much is known about the immune responses of plants and, moreover, how much there is to know. There is, I found, detailed molecular information about how our botanical cousins defend themselves against the onslaught of infectious agents. Perhaps most surprising is that plants and animals share basic mechanisms of immunity. Here I am referring to innate immunity, being that plants — like the invertebrates — do not have the adaptive immunity of vertebrates. Did these arise before the two realms diverged about one billion years ago? Or, alternatively, are they the result of convergent evolution?

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