Scientists found that DNA once dismissed as "junk" helps chromosomes find their partners
Repetitive DNA near chromosome centers forms a unique barcode for partner recognition.
This barcode guides chromosomes to their correct partners during egg cell development.
When this DNA barcode is disrupted, chromosomes pair incorrectly or fail to pair.
A quality-control system eliminates eggs with such errors before they mature.
This discovery revives an old idea about "junk" DNA's role in reproduction.
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