Normal reconstitution of CD45RA⁺ T cells of the CD8⁺ subset in the thymectomized and the thymus-bearing hosts. CD45 isotype expression was examined on gated CD8⁺ cells identified by PerCP. The dot plots depict CD45RA⁺ (FITC, FL1) cells versus CD45RO⁺ (PE, FL2) cells. Columns A and B show the distribution of CD45 isoform expression at 6 and 9 months, respectively, after allogeneic BMT. Absolute counts of CD8⁺ cells at 6 and 9 months were 333/μL and 587/μL in the thymectomized host, 31/μL and 54/μL in the thymus-bearing host no. 1, 185/μL and 371/μL in host no. 2, 122/μL and 165/μL in host no. 3, 287/μL and 218/μL in host no. 4, and 50/μL and 41/μL in host no. 5.