different models were used but the two basic ones were : ( a ) mice grafted intraperitoneally at 15 days of age with a syngeneic thymus that was removed surgically at 10 , 20 , or 30 days after grafting , and ( b ) mice grafted at 15 days of age with allogeneic strain a thymoma or c57bl thymus , these representing situations in which there is spontaneous rejection of the restoring graft .
C0040100
thymoma
C0040113
thymus