RNA interference is thought to have evolved to

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RNA interference (RNAi) is a biological process in which RNA molecules inhibit gene expression or translation, by neutralizing targeted mRNA molecules. It is thought to have evolved as a defense mechanism against viruses and transposable elements, helping to protect the genome from these potentially harmful invaders. RNAi can recognize and degrade foreign RNA molecules, such as those from viruses, thereby preventing them from hijacking the cell's machinery for their own replication.

RNA Interference Is Thought to Have Evolved to