INDUSTRIAL APPLICABILITY The present invention can effectively suppress the decrease in cell viability that occurs when mammalian cells are stored in liquid and the decrease in self-renewal ability that occurs when mammalian stem cells are stored in liquid, and also the mammalian cells. Is an object of the present invention to provide a solution for preserving mammalian cells, etc., which has a low possibility of adversely affecting the ecology of the mammal when administered into the living body of the mammal. Alternatively, the mammalian cells are preserved using a mammalian cell preservation solution containing these salts and a hydrogen carbonate such as sodium hydrogen carbonate as a pH adjuster and having a pH of 6.5 to 8.5. To do.
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