Variant: A variant represents a change in DNA sequence relative to a reference sequence. For example, a variant could represent a SNP or an insertion. Variants belong to a variant set. Each of the calls on a variant represent a determination of genotype with respect to that variant. For example, a call might assign probability of 0.32 to the occurrence of a SNP named rs1234 in a sample named NA12345. A call belongs to a call set, which contains related calls typically from one sample.

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