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supposed ‘junk’ dna; but the more is known, the more is seen how little is known

“But ultraconserved segments are particularly unusual because they are 100% identical in man and mouse. Until now, some thought they were human DNA that had contaminated mouse samples. "People had a hard time believing it," Frazer says.

“The presence of exact copies in different animals suggests that even tiny changes in the sequence of these segments destroy whatever they do, and have been weeded out during evolution. Non-essential regions of DNA, by contrast, tend to accumulate mutations so that the sequences vary in different organisms.”

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