Contrary to the explanation given in the show, introns are not useless material. While it is true that introns to not directly translate to amino acid sequences in proteins, they act as markers which allow the cell to process the DNA in more complex fashions than simple linear translation. For example, in terms of computer programming, some intron sequences act as a sort of subroutine, causing a sequence elsewhere in the DNA fragment to be inserted into an in-progress protein.
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