Abstract
When portions of adult renal tissue are allografted into the rabbit ear chamber, they usually survive for periods of up to several months (6). When a kidney from the same donor is grafted as a whole organ, the ear chamber grafts then reject with the whole organ in 7 days. During that time serial needle biopsies of the whole organ are compared with the in vivo appearance of the ear chamber grafts. This establishes that the changes occurring in the ear chamber grafts are monitoring the rejection process proceeding in the whole organ grafts.