How long can stem cells be stored for?

It is theoretically assumed that deeply frozen stem cells (-150 °C) can be stored for centuries. In practice, we base our knowledge on the findings made by Japanese scientists who tested stem cell viability frozen in 1973. These studies support the hypothesis that the defrosted cells have the potential to proliferate and to form colonies. Current findings substantiate the theory that cord blood stem cells preserved for 24 years still maintain their properties.