A large enough number of stem cells are needed to ensure the success of a cord blood transplant. However, the quantity of stem cells isolated from umbilical cord blood is not always sufficient to meet that requirement. Researchers from the Etablissement Français du Sang, Aquitaine-Limousin (France) have established a method to multiply cord blood stem cells to required quantity levels. In the current study Dr. Ivanovic and co-workers (Etablissement Français du Sang Aquitaine-Limousin) and a team of Cryo-Save researchers have demonstrated that these cultured stem cells can be frozen and thawed without negatively affecting the quality of the stem cells. An important step towards successful stem cell transplants in patients for whom too few stem cells are available.