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The privet tree, Ligustrum obtusifolium (Oleaceae), defends its leaves against insects with a strong lysine-decreasing activity that make proteins non-nutritive. This is caused by oleuropein, an iridoid glycoside. We previously found that some privet-specialist caterpillars adapt by secreting glycine in the digestive juice as a neutralizer that prevents the loss of lysine. Here, we extended the survey...
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