B. thuringiensis (Bt) is a gram-positive, soil-dwelling, spore-forming, rod-shaped bacteria. It is approximately 1 µm in width and 5 µm in length. It grows at body temperature and produces a diamond-shaped crystal from its crystal proteins (Cry proteins) and uses it to fend off insects, predators, and other pathogens.
https://www.lifeasible.com/p/5048/recombinant-bacillus-thuringiensis-vip3a-protein/
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