A primer is short oligo made from nucleic acids. It is the starting point for DNA polymerases to start DNA synthesis. DNA polymerases can only synthesize enlarge existing nucleic but not generate new ones 'de novo'. Primers can be made of DNA (for PCR) or RNA (naturally occuring).

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Multiplex PCR, shorter amplicon inhibiting longer amplicon?

I want to run multiplex PCRs for my genotyping, with a primer pair targeting my construct and a primer pair targeting some housekeeping gene (sort of a built-in control). I designed the control ...