Caption

DNA lettering. Artwork showing the word "DNA" in digital lettering over a sequence of nucleotide bases that makes up the code of DNA (deoxyribonucleic acid). It is this sequence of four bases that determines the genetic instructions necessary to build a living organism. Here each base is represented by a letter: adenine (a), thymine (t), cytosine (c) and guanine (g). A gene sequence of these bases may characterise one of the many genetic traits in humans such as hair or eye colour.