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What is a microRNA?

What is a microRNA? Here are some definitions.

Noun
  1. (genetics) A single-stranded, non-coding form of RNA, having only about 20-30 nucleotides, that has a number of functions including the regulation of gene expression
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Examples
MicroRNA 150 has been shown to downregulate the expression of C-MYB, a transcription factor that plays a significant role in megakaryopoiesis.
A pleiotropically acting microRNA, mir-31, inhibits breast cancer metastasis.
Distance constraints between microRNA target sites dictate efficacy and cooperativity.
Breast cancer metastasis suppressor 1 coordinately regulates metastasis-associated microRNA expression.
Dicer is a protein that converts inactive hairpin-structured microRNA precursors into their active single stranded form.
A single anti-microRNA antisense oligodeoxyribonucleotide targeting multiple microRNAs offers an improved approach for microRNA interference.

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