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Definition: An oncomir (also oncomiR) is a microRNA (miRNA) that is associated with cancer. MicroRNAs are short RNA molecules about 22 nucleotides in length. Essentially, miRNAs specifically target certain messenger RNAs (mRNAs) to prevent them from coding for a specific protein.

‘The way by which an oncomiR typically functions is through targeting tumor-suppressive protein-coding transcripts via canonical mechanisms, or through other less understood noncanonical mechanisms.’ 

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