The primers. http://en.wikipedia.org/wiki/File:Primers_RevComp.svg

Melting the template DNA. http://en.wikipedia.org/wiki/File:Primers_RevComp_Melted2.svg
Annealing of the primers. http://en.wikipedia.org/wiki/File:Primers_RevComp_Annealed2.svg
Elongation by DNA polymerase from the primers. http://en.wikipedia.org/wiki/File:Primers_RevComp_Elongation2.svg
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