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RNA Keeper Tissue Stabilizer is a non-toxic solution that quickly penetrates into tissues, inactivates endogenous RNase, and immediately stabilizes and protects RNA integrity. Immersed in RNA Keeper Tissue Stabilizer, fresh tissue samples can be stored at 37℃ for 1 day, room temperature for 1 week, 4℃ for 4 weeks or stored at -80 ~-20℃ for a long time, which are not required to be frozen in liquid nitrogen. Repeated Freezing and thawing does not significantly affect the integrity of the RNA. Samples stored in the RNA Keeper Tissue Stabilizer can be directly used for RNA extraction using FastPure cell/tissue total RNA isolation kit(Vazyme#RC112). RNA Keeper Tissue Stabilizer can be also used for the preservation of tissues such as brain, heart, liver, pancreas, kidney, spleen, testes, muscles and the like.