query: Has RNA been proven?
passage: RNA world
The RNA world is a hypothetical stage in the evolutionary history of life on Earth, in which self-replicating RNA molecules proliferated before the evolution of DNA and proteins. The term also refers to the hypothesis that posits the existence of this stage.
passage: Vault RNA
As the field progressed into the 2000s, more research was done on the structure and biological capabilities of the molecule. More recently, there have been a few experiments on vault RNA.