The present disclosure provides a cell system comprising eukaryotic cells in ahydrogel comprising nanofibrillar cellulose in cell storage medium at atemperature in the range of 0-25°C. The present disclosure alsoprovides amethod for storing eukaryotic cells, the method comprising providingeukaryotic cells, providing nanofibrillar cellulose, combining the cells andthenanofibrillar cellulose to form the cell system, and storing the cell systemat atemperature in the range of 0-25°C.