PCT No. PCT / US94 / 05844 Sec. 371 Date Jun. 6, 1995 Sec. 102(e) Date Jun. 6, 1995 PCT Filed May 24, 1994 PCT Pub. No. WO94 / 27622 PCT Pub. Date Dec. 8, 1993This invention provides a method for developing
immune tolerance in xenogeneic organ graft recipients, in which lympho-hematopoietic cells from an intended organ graft recipient are differentiated within a xenogeneic surrogate, such as a fetal animal. After birth of the surrogate, the matured lympho-hematopoietic cells containing
antigen specific regulatory cells, including
suppressor cells, veto cells, select B cells, anti-
idiotype antibodies, and other
related factors responsible for
antigen specific tolerance in a surrogate animal are reintroduced into the intended organ graft recipient, in conjunction with an organ transplant or a
tissue transplant from the xenograft surrogate. The invention also provides an organ graft repopulated with cells from the intended organ graft recipient produced in a surrogate animal.