Between the genes: Making sense of genomic 'dark matter'

Scientists have uncovered some of the secrets behind what molecular biologists call "dark matter" transcripts. The term "dark matter" refers to the genomic output that does not originate from known genes, arising instead from regions that were once thought of as nothing more than "junk DNA." When genetic signals, namely RNA transcripts, were discovered coming from these areas, many believed there was a whole new mystery to solve, and that much more was going on than originally expected.

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