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how does polymerase stop at the required length - (Jun/06/2013 )

can any one explain how does the polymerase enzyme stops at the required length of the product and will not give extended strands of DNA in PCR?

-Chomolungma-

The best way to understand is to watch videos:

http://www.youtube.com/results?search_query=pcr+reaction&oq=pcr+reaction&gs_l=youtube.3..0l2.983.3141.0.3391.12.8.0.4.4.0.48.276.8.8.0...0.0...1ac.1.11.youtube.FD-YnE-V3Ic

-Curtis-