“…However, the momentum carrying organ and bone marrow transplantation on a common pathway was lost between 1959 and 1962 when the combination of total-body irradiation and bone marrow replacement proved to be uniformly lethal as a step to organ transplantation in large outbred animals (28,29). More important, the incentive to continue such efforts was eroded when 6 human kidney allografts, one in Boston (30) and 5 in Paris (31,32), functioned for extended periods (> 1 year) after their transplantation between January 1959 and early 1962 following sublethal total-body irradiation without bone marrow. The case for a bone marrow component declined further when extended canine (33) and human (34, 35) kidney transplant survival was accomplished solely with drugs.…”