DNA Sequencing · Pathology

The term 'read' in DNA sequencing refers to:

  1. The process of purifying DNA
  2. The adapter sequence ligated to both ends of each DNA fragment
  3. The nucleotide sequence derived from a single DNA fragment
  4. The reference genome used for alignment
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Correct answer: The nucleotide sequence derived from a single DNA fragment

A 'read' is the sequence data output from the sequencer that corresponds to one fragment of the DNA template. A single sequencing run produces millions or billions of reads, which are then aligned to a reference genome to identify variants.

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