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The inherent chemical structure of RNA makes it less stable than DNA. RNases that degrade RNA are also more prevalent than DNases.
As RNA is a great deal more sensitive to degradation compared to DNA, for short term storage we recommend using a neutral to slightly acidic buffer containing a chelator. However, RNA is most stable when stored as an ethanol precipitate at –80°C, especially when storing RNA oligos long term.
The biggest concern for RNA oligonucleotide storage is avoiding RNase.