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And ancient DNA research has come leaps and bounds. Ancient RNA has fallen behind. This is mostly due to DNA being sturdier than RNA. That means that the left phone is breaking down the same way RNA does. DNA is the blueprint of an organism, and there are limits to just how much information it can reveal after it's been broken down. a messenger RNA or mRNA acts as a messenger for DNA. It carries copies of DNA instruction from the nucleus to the cell. And at this point, other parts of the cell follow the coded instructions.