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DNA (Deoxyribonucleic acid) was the nucleic acid that served as the basis for carbon-based life. (TV: School Reunion) It was noted for its double-helix shape, at least in human societies. (TV: Evolution of the Daleks)
In an alternate Paris of 1804, Garce and Eging commented on the idea of the double-helix, finding it ridiculous that two snakes coiled together were inside all humans. (PROSE: The Man in the Velvet Mask)
According to the Eighth Doctor, he had quadruple-helix DNA, but only three out of the four strands were visible to non-temporally aligned scanners (therefore part of his DNA was linked to the Time Vortex). (PROSE: Frontier Worlds)
A sentient cell culture known as the Culture was endangered by an infection of viruses which inserted their DNA into the Culture cells, turning them into nurseries for incubation of more invaders. (COMIC: Culture Shock)