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Apart from what WYSIWYG said. It might also be the case that you need to re-sequence because you're interested in seeing the changes that might have occurred since the last sequencing. Remember that cells keep dividing and therefore changing, so the DNA is slightly different from one cell to another (and from one population of cells or tissues to another). ...


Is that correct that a complete DNA sequencing (the whole genome) need only to be done once (per person)? Likely, yes. But I think you vastly overestimate how often this is done. If someone gets their DNA "sequenced" at 23andMe, for example, they are not getting their whole genome sequenced. They are getting individual bits believed to be possibly ...

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