(C) The bacterium $Bacillus$ $thuringiensis$ is a common soil bacterium,which produces a protein toxin that kills certain insects.This toxin is a crys

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(C) The bacterium $Bacillus$ $thuringiensis$ is a common soil bacterium,which produces a protein toxin that kills certain insects.This toxin is a crystal $(Cry)$ protein.There are several kinds of $cry$ toxins which are toxic to different groups of insects.The gene encoding the $Cry$ protein is called the $cry$ gene.