Why is cord blood (and not marrow) becoming increasingly popular?

“Matching donor and recipient marrow is very difficult, as a so-called “full match” is usually required. “full compatibility”. Stem cells from cord blood are characterized by less immunological “maturity”, so their transplantation causes fewer complications in the recipient (in the case of allogeneic transplantation, it’s a lower risk of rejection and a less pronounced “graft versus host” reaction).”