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Feed Plants Tag Insect Herbivores With An Alarm (sciencedaily.com)

Rooted in place, plants can't run from herbivores -- but they can fight back. Sensing attack, plants frequently generate toxins, emit volatile chemicals to attract the pest's natural enemies, or launch other defensive tactics. Now, for the first time, researchers have identified a specific class of small peptide elicitors, or plant defense signals, that help plants react to insect attack.

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