RNA Safer LS Reagent is a RNA protective agent specifically designed for liquid samples (blood, saliva and cell culture medium). It contains cationic surfactants, which can quickly and efficiently cleave cells to form stable electro neutral complexes and protect RNA from degradation. After mixing with RNA Safer LS Reagent, Liquid samples such as blood, saliva, serum, plasma, urine and cell culture medium can be stored at room temperature for three days, stored at 2-8℃ for one week, or -20℃ / -80℃ for at least six months. The reagent has been successfully applied to the protection of cell culture medium, saliva RNA and blood RNA.