↑What is "already known" in this topic: MicroRNAs (miRNAs) are known as a new class of small RNAs (18-25 nucleotides) which regulate gene expression at multiple levels from transcription to translation. Considering the important role of miRNAs in cell proliferation, differentiation, and apoptosis, any variations in their expression can contribute to various anomalies, such as tumorigenesis.
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