?:definition
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Any process that increases the rate, frequency, or extent of a mRNA catabolic process, the chemical reactions and pathways resulting in the breakdown of RNA, ribonucleic acid, one of the two main type of nucleic acid, consisting of a long, unbranched macromolecule formed from ribonucleotides joined in 3\',5\'-phosphodiester linkage. [GOC:ascb_2009, GOC:dph, GOC:tb]
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