spacer deoxyribonucleic acid

spacer deoxyribonucleic acid

[¦spās·ər dē¦äk·sē‚rī·bō·nü‚klē·ik ′as·əd] (cell and molecular biology) Untranscribed deoxyribonucleic acid (DNA) segments, usually containing repetitious DNA, of eukaryotic and some viral genomes flanking functional genetic regions (cistrons).