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What are cry proteins? Name an organism ...

What are cry proteins? Name an organism that produce it. How has man exploited this protein to his benefit ?

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The toxin is coded by a gene cry IAc named cry, which is produced by Bacillus thuringiensis.
This gene is isolated from Bt and introduced into crops having better productivity. So pesticides are not needed. e.g. Bt cotton, Bt com.
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