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exordium
exoskeleton
exosmosis
exosphere
exospore
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exonuclease
ex·o·nu·cle·ase [ èksō nklee àyss, èksō nklee àyz ] (plural ex·o·nu·cle·as·es)


noun 
Definition:
 
enzyme that breaks down nucleic acid: an enzyme that breaks down a nucleic acid by detaching the terminal nucleotides from the end of a chain
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