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Vector

A carrier, for example, a mosquito is a vector for malaria. In the context of biocontrol, a vector carries the control agent to the target organisms, for example, blowflies spread calicivirus amongst rabbits – the blowflies are the vectors. In genetic engineering, a vector is a tool used to carry a gene of interest. Vectors are small pieces of DNA, often a plasmid, and are used to carry foreign DNA into a cell.