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I can't get past the sub headline: > Twins' DNA 'shockingly similar'

Identical twins are supposed to have identical DNA, right? Or did I really misunderstand a lot of school.

No amount of schooling could have truly prepared you for precisely how similar twins' DNA would be. Shockingly similar.

As I understood it he expected the different results were due to contamination or other errors resulting in compromizing the raw data to some degree. The shocking part was that the raw data was ok while the results weren't ok to the same degree.

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