Combining multiple PCR primer pairs for each amplicon can improve SNP genotyping accuracy by reducing allelic drop-out.

Abstract excerpt

We have developed a systematic, single-tube assay approach to reduce the chance of SNP genotyping error due to otherwise unidentifiable allelic drop-out during PCR amplification. Allelic drop-out in such cases would normally be caused by additional and rare genetic variation within the PCR primer site sequence itself. Our method is novel in that it does not require prior knowledge of the additional "hidden"...

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