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20 years Have passed since it announced the sequencing of the human genome, a milestone that was presented as a revolution in the diagnosis, prevention and treatment of most diseases. During all this time, the reading of our “bar code” has been refined to be the most accurate and complete that there has ever been of any vertebrate. However, our DNA is so intricate and still hides many secrets. Now, for the first time, scientists have determined the complete sequence of a human chromosome from one end to the other (telomere to telomere) with no spaces and a level of unprecedented precision.

In particular, the chromosome studied of the 46 that holds each individual in the