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NetPrimer is a gratis web-based tool used for analysing primers used in PCR to amplify a DNA sequence. [2] The software predicts the melting temperature of the primers using the nearest neighbor thermodynamic algorithm. The accurate prediction of the melting temperature (Tm) is one of the most important factors that governs the success of a PCR ...
The last 10-12 bases at the 3' end of a primer are sensitive to initiation of polymerase extension and general primer stability on the template binding site. The effect of a single mismatch at these last 10 bases at the 3' end of the primer depends on its position and local structure, reducing the primer binding, selectivity, and PCR efficiency.
Except for the C/G initiation term, the first term represents the free energy of the first base pair, CG, in the absence of a nearest neighbor. The second term includes both the free energy of formation of the second base pair, GC, and stacking interaction between this base pair and the previous base pair. The remaining terms are similarly defined.
Primer dimers may be visible after gel electrophoresis of the PCR product. PDs in ethidium bromide-stained gels are typically seen as a 30-50 base-pair (bp) band or smear of moderate to high intensity and distinguishable from the band of the target sequence, which is typically longer than 50 bp.
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The primer may contain a single substitution or contain a new sequence at its 5' end. If a deletion is required, a sequence that is 5' of the deletion is added, because the 3' end of the primer must have complementarity to the template strand so that the primer can sufficiently anneal to the template DNA.