Mesenchymal stem cell homing to tissue damage, umbilical cord stem cells historically used for anti-aging, mesenchymal stem cells role in immune system modulation, inflammation reduction and stimulating tissue regeneration, donor stem cell safety and testing, the role of HLA matching in donated umbilical cord-derived stem cells, umbilical cord blood safety data and historical use in blood transfusions, allogeneic stem cell persistence in human mothers.