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How has Agrobacterium tumifaciens been s...

How has Agrobacterium tumifaciens been suitably modified to act as a clon-ing vector ?

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The tumour inducing (Ti) plasmid of Agrobacterium tumifaciens has now been modified into a cloning vector which is no more patho-genic to the plants but is still able to use the mechanisms to deliver genes of our interest into variety of plants .
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