Stem cells or meristems

"Immune potential of umbilical cord blood is low. Graft-versus-host reactions occur less frequently"(when compared to adult stem cells). Wonder if the decision making patterns of an adult modify its morphology enough to reflect the state of its being. An adult stem cell transplant have greater chances of a graft-versus-host disease or of host rejection of the graft than the transplant of stem cells from that of the umbilicus - a product of a li'l human being that has not yet found ways of 'being'(?) but is as fresh as the stem cells themselves (?). The immune system is the protection mechanism - a part of the survival kit - that protects and preserves an organism, from 'another.' As it is in the macrocosm, so it is in the microcosm. Wonder how far is it true that the intricacies that differentiate one into apparent two is in response to the interaction between anti-particle (or anti-state) and its state. Wonder if this is is a thought that could be true onto the macrocosm.