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Ribonucleic Acid (RNA) is one of two principal types of nucleic acid found in all cellular life. The molecule consists of a polymer of ribonucleoside phosphates, each unit of which, in turn, is comprised of a pyrimidine base or purine base, a ribose sugar, and a phosphate. RNAs encode genetic information (e.g., RNA viruses), serve as intermediates in gene transcription (e.g., mRNA), and also play structural, regulatory, and catalytic (e.g., ribosome) roles in cellular biology.