while an increasing pool of processed t cells accumulates during stages 41-49 , the persistent defective allograft response displayed by animals thymectomized during these stages suggests that early thymectomy may leave a population of alloreactive cells qualitatively defective in some subpopulation necessary for normal allograft responses , or that any residual cells processed prior to thymectomy are capable of only limited clonal expansion .
C0007634
cells
C1516670
clonal expansion