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RNA : ribonucleic acid; polynucleotide consisting essentially of chains with a repeating backbone of phosphate and ribose units to which nitrogenous bases are attached; RNA is unique among biological macromolecules in that it can encode genetic information, serve as an abundant structural component of cells, and also possesses catalytic activity.
RNA (ribonucleic acid)— a complex molecule that is found in the cell cytoplasm and nucleus. One function of RNA is to direct the building of proteins. (Source: excerpt from Microbes in Sickness and in Health -- Publications, National Institute of Allergy and Infectious Diseases: NIAID)
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