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The control of host-specificity in the Rhizobium-legume symbiosis has been a topic of long-standing interest to plant biologists. By the early 1990s, biologists had deciphered the chemical signals that trigger early symbiotic responses. Flavonoids from the plant root trigger bacterial gene expression and the production of lipo-chitooligosaccharide signals (called Nod factors) that are recognized by...
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