
Antisense RNA (asRNA) is a single-stranded RNA that is complementary to a messenger RNA (mRNA) strand transcribed within a cell. Some authors have used the term micRNA (mRNA-interfering complementary RNA) to refer to these RNAs but it is not widely used. Antisense RNA may be introduced into a cell to inhibit translation of a complementary mRNA by ...
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http://en.wikipedia.org/wiki/Antisense_RNA

Small pieces of RNA that can bind to specific molecules of RNA and block the cell
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http://www.cancer.gov/dictionary?expand=A

A complementary RNA sequence that binds to a naturally occurring (sense) mRNA molecule, thus blocking its translation. (See RNA.)
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http://www.encyclo.co.uk/local/20095

<molecular biology> A complementary RNA sequence that binds to (and thus blocks the transcription of) a naturally-occuring (sense) messenger RNA molecule. ... These proteins can be used to selectively turn off production of certain proteins or block viral genetic instructions, by marking them for destruction by cellular enzymes, in order to p...
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http://www.encyclo.co.uk/local/20973

Type: Term Definitions: 1. the transcription product of the DNA antisense strand; it can play a role in the inhibition of translation.
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http://www.medilexicon.com/medicaldictionary.php?t=78463

small noncoding RNA molecules that inhibit gene expression by binding to mRNA transcripts via complementary base pairing
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https://courses.lumenlearning.com/microbiology/chapter/glossary/
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