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Single nucleotide polymorphisms, or SNPs, are differences between two sequences of DNA at one individual nucleotide location.

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Chromosome position mismatch for SNPs in dna tests

TL;DR: why is the position reported by DNA testing companies for an SNP on a particular chromosome different than the one in dbSNP/SNPedia databases? … Strangely, there is also a (smaller) number of discrepancies on the chromosome and position reported for the same SNP (about 0.02% of the rs-ids that are common to both exports). …
Erwin Bolwidt's user avatar