An acronym for the four nucleotide bases in DNA: adenine, cytosine, thymine, and guanine, which form the building blocks of genetic code.
Each letter represents the first letter of a nucleotide base discovered during early molecular biology research in the early-to-mid 20th century; the acronym became standard shorthand in genetics.
Those four letters—A, C, T, G—are literally the alphabet of life itself; every organism that ever existed is written in just these four characters, making it the most powerful and economical code system in the universe!
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