Provide the reagent A, necessary to carry out the following conversion. 
Definitions:
PCR
Polymerase Chain Reaction, a laboratory technique used to amplify DNA sequences, making millions of copies of a specific DNA section.
Restriction Enzymes
Proteins used in molecular biology that cut DNA at specific sequences, important for DNA modification and analysis tasks.
Recombinant DNA (rDNA)
DNA that contains genes from more than one source.
Vectors
Organisms, often insects, that transmit pathogens between humans or from animals to humans.
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