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Assays for biological activity. GA, samples from R. prolixus nymphs carrying the R. rhodnii symbiont transformed to express the cecropin A gene product. WT, samples from R. prolixus nymphs carrying native symbionts. Synthetic CecA, control incubations with 10 μl sterile Luria–Bertani medium. Gut contents from insects carrying the cecropin A-expressing symbionts markedly inhibited the growth of E. coli.
