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Survival of primed T. castaneum larvae during 8 days post-challenge with spores of Btt (a), BtS (b), BtEG (c) and PBS (d) as a control treatment. The priming effect was specifically triggered only by two homologously primed/challenged strain combinations (a,b), while the engineered strain failed to provoke any priming response (c). Significant differences are indicated by asterisks.
