sentence: In contrast , gut renewal after ingesting the Pseudomona entomophila was dose dependent : lethal bacterial concentrations did not induce an increased rate of gut renewal , but sublethal concentrations did.Although delta-endotoxins ( Cry toxins ) are known as the primary virulence factor from B. thuringiensis , this bacterium has also developed an arsenal of additional virulence factors such as beta-exotoxins , vegetative insecticidal proteins ( Vip ) , chitinases , zwittermicin , spores and other uncharacterized spore-associated factors [ 2 ] ; [ 40 ] – [ 43 ] .