There will always be more to Nature than meets the eye. During the 1950s and the 1960s, the importance of RNA in protein synthesis gradually emerged. RNA has always been seen as a linear molecule, a bit like a sentence which has a beginning and an end, and is read from one end to the other, letter by letter, word by word. Yet in the 1970s, scientists discovered another kind of RNA molecule: one that was, to their surprise, circular. Circular RNAs were first thought to be biological oddities, something that had gone wrong in the process of transcribing a gene, and which drifted in a cell's cytoplasm the way flotsam would in the sea. But as the years went by and technology evolved, it became all too clear that there was far too much circular RNA swilling around cells for its presence to be purely accidental. Today, not only are researchers discovering that circular RNAs - or circRNAs - seem to be another way of regulating gene expression but some circRNAs can also give rise to proteins. One such circRNA is known as cir-ZNF609.
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