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{{See also|DNA microarray|SNP genotyping}}
{{expert needed|Computational Biology|date=April 2016}}
In [[molecular biology]], '''SNP array''' is a type of [[DNA microarray]] which is used to detect [[Polymorphism (biology)|polymorphisms]] within a population. A [[single nucleotide polymorphism]] (SNP), a variation at a single site in [[DNA]], is the most frequent type of variation in the genome. Around 325335 million SNPs have been identified in the [[human genome]],<ref>{{cite web|title=dbSNP Summary|url=https://www.ncbi.nlm.nih.gov/projects/SNP/snp_summary.cgi|website=www.ncbi.nlm.nih.gov|accessdate=4 October 2017}}</ref> 15 million of which are present at frequencies of 1% or higher across different populations worldwide.<ref name="DurbinAltshuler2010">{{cite journal|last1=Durbin|first1=Richard M.|last2=Altshuler|first2=David L.|last3=Durbin|first3=Richard M.|last4=Abecasis|first4=Gonçalo R.|last5=Bentley|first5=David R.|last6=Chakravarti|first6=Aravinda|last7=Clark|first7=Andrew G.|last8=Collins|first8=Francis S.|last9=De La Vega|first9=Francisco M.|last10=Donnelly|first10=Peter|last11=Egholm|first11=Michael|last12=Flicek|first12=Paul|last13=Gabriel|first13=Stacey B.|last14=Gibbs|first14=Richard A.|last15=Knoppers|first15=Bartha M.|last16=Lander|first16=Eric S.|last17=Lehrach|first17=Hans|last18=Mardis|first18=Elaine R.|last19=McVean|first19=Gil 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==Principles==
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