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Schematic representation of ncRNAs of different lengths. Small ncRNAs are shorter than 200 nucleotides, including miRNAs (21–23 nucleotides), piRNAs (26–31 nucleotides), snoRNAs (60–140 nucleotides), and snRNAs (~ 150 nucleotides). In contrast to small ncRNAs, lncRNAs are longer than 200 nucleotides, reaching up to thousands of nucleotides of length. CircRNAs are a peculiar group of endogenous lncRNAs molecules, consisting of at least a few hundred nucleotides
