Proteins are large, complex molecules that play many critical roles in the body and are produced following the instructions encoded in DNA. By reading their DNA letters, cells produce an intermediate RNA molecule that will give rise to the corresponding protein. Most diseases occur with altered protein levels, which are either a cause or consequence of the condition itself. RNA plays a pivotal role in diseases with altered protein levels by serving as the intermediary messenger between DNA and protein.
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Source: Phys.org