| To date, systemin has been described for tomato only, and not even for other solanaceous plants such as tobacco. |
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| After an insect attack tomato plants produce systemin, a plant peptide hormone. |
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| The compound, systemin, activates or turns on genes that produce two proteinase inhibitors. |
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| Systemin activates defensive mechanisms, such as the production of protease inhibitors to slow the growth of insects. |
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