<![CDATA[SNP的相关概念]]>https://gatk.broadinstitute.org/hc/en-us/articles/360035890771-Biallelic-vs-Multiallelic-sites
双等位
A biallelic site is a specific locus in a genome that contains two observed alleles, counting the reference as one, and therefore allowing for one variant allele.
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多等位
A multiallelic site is a specific locus in a genome that contains three or more observed alleles, again counting the reference as one, and therefore allowing for two or more variant alleles.
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