What are Cry proteins? Name an organism that produces it

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

The proteins encoded by the gene named cry are called Cry proteins. Organism that produces Cry proteins is Bacillus thuringiensis.
The cry genes are incorporated in several crop plants, which then develop resistance to a specific targeted pest, e.g. cry LAc and cry IIAb control the cotton bollworms and cry LAb controls corn borer.