Stumbled on this one yesterday while looking for something else.
Adaptive evolution of threonine deaminase in plant defense against insect herbivores
In a nutshell, tomato expresses a gene in response to herbivore feeding. The ingested protein is cleaved in the lepidopteran gut where it becomes active and degrades threonine, an amino acid needed by the insect.
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Ignorance more frequently begets knowledge: it is those who know little, and not those who know much, who so positively assert that this or that problem will never be solved by science. --Charles Darwin
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