When the immune system is not in excellent condition, serious diseases can occur in the body. Therefore, storing NK cells at birth is an investment in the health of your children and of compatible family members.
It is possible to store them both for autologous use (i.e. by the same individual from which they were taken) and for haploidentical use (i.e. by relatives compatible to 50%). Infusion of haploidentical NK cells is a safe practice.