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Prompt: Product Position - Primer can be located near the 5' end, the 3' end or...

Prompt:

Product Position - Primer can be located near the 5' end, the 3' end or any where within specified length. Generally, the sequence close to the 3' end is known with greater confidence and hence preferred most frequently.

Question:

Why is it that the sequence close to the 3' is preferred?

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Answer #1

GC content : The GC content ( the number of G's and C's in the primer as a percentage of the total bases ) of primer bases should be more than 60%

GC clamp : The presence of G or C bases within the last 5 bases from the 3' end of the primers helps promote specific binding at the 3' end due to the stronger bonding of G and C bases . More than 3 G's or C's should be avoided in the last 5 bases at the 3' end of the primer.

Hence by considering this reason the sequence close to the 3' end is preferred.

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