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Genes aren't the only organizational unit within an organism's genetic sequence. Researchers have found other larger structures whose functions are less clear. Now, in the March Physical Review E, a team reports evidence for the largest unit yet seen--stretches of tens of millions of DNA "letters" that appear to make up a single unit of some sort. Furthermore, the individual genes within these "superstructures" are more related than chance would suggest, implying that the new structures have some biological purpose.

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Category: Science