Cord blood transplant proof of concept
Studies led by Dr. Edward A. Boyse indicate that umbilical cord blood can be transplanted instead of bone marrow to reconstitute the human immune system. The research predated the first cord blood transplant in Oct. 1988, but was not published until May 1989.
Broxmeyer, HE et al. 1989 Proc. Natl. Acad. Sci. 86(10):3828-3832 (abstract)