1. Circular RNAs are a large class of animal RNAs with regulatory;Memczak;potency,2013
2. Viroids are single-stranded covalently closed circular RNA molecules existing as highly base-paired rod-like structures;Sanger,1976
3. Electron microscopic evidence for the circular form of RNA in the cytoplasm of eukaryotic cells;Hsu,1979
4. Exon skipping and circular RNA formation in transcripts of the human cytochrome P-450 2C18 gene in epidermis and of the rat androgen binding protein gene in testis;Zaphiropoulos,1997