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The noncoding RNA family. (A) microRNAA: miRNA, 19-23 bp. (B) Piwi-interacting RNA: piRNA, 24-30 bp. (C) Small interfering RNA: siRNA, 21-25 bp. (D) Long noncoding RNA: lncRNA, > 200 bp, linear. (E) Circular RNA: circRNA, > 200 bp, circular. (F) Transfer RNA: tRNA, 74-95 bp. (G) Ribosomal RNA: rRNA, 121-5000 bp. (H) Small nuclear RNA: snRNA, 100-300 bp. (I) Small nucleolar RNA: snoRNA, 100-300 bp (i.e. H/ACA box snoRNA). (J) Guide RNA: gRNA, 55-70 bp.
