<a href="//en.wikipedia.org/wiki/DNA_sequencing" title="DNA sequencing">DNA sequencing</a> technology cannot read whole genomes in one go, but rather reads small pieces of between 20 and 30000 bases, depending on the technology used. Typically the short fragments, called reads, result from <a href="//en.wikipedia.org/wiki/Shotgun_sequencing" title="Shotgun sequencing">shotgun sequencing</a> <a href="//en.wikipedia.org/wiki/Genome" title="Genome">genomic</a> DNA, or <a href="//en.wikipedia.org/wiki/Transcrip