CNS, DNA, NRC, RNA three-letter are medical abbreviation stands for something you won't find in the body.
What is RNA?
All living cells contain Ribonucleic acid, which is also known as RNA and has structural similarities to DNA. However, RNA is often single-stranded, unlike DNA. Instead of the deoxyribose present in DNA, the backbone of an RNA molecule is made up of alternating phosphate groups and the sugar ribose. Each sugar has one of the four bases adenine (A), uracil (U), cytosine (C), or guanine attached to it (G). Cells contain a variety of RNA types, including transfer RNAs, messenger RNA, and ribosomal RNA. Additionally, certain RNAs control the expression of genes. RNA serves as the genomic material for several viruses.
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