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The VCF Format and Its Coordinate Assumption

How the variant call format anchors every variant to a reference position, and why that assumption breaks down inside a long insertion.

Questions this Concept answers

Why does mixing zero-based and one-based coordinate files without conversion cause silent off-by-one errors?

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Variant Call Format (VCF) Files in Genomics

The Variant Call Format (VCF) is a standardized, compact text-file specification for recording genetic variants — the positional differences between an individual's (or population's) sequenced DNA an…