T-cell subtype populations and PHA responses before and after thymus transplantation. Subject 1 is shown in (A-C); and subject 2 is shown in (D-F). (A,D) T-cell phenotypes are shown; (B,E) naive T cells are shown; and (C,F) proliferative responses to PHA is shown. (A-B) The data points starting at 2.1 years were obtained by the referring hospital laboratory. (D-E) The first 3 data points and the data points starting at 1.4 years after transplantation were obtained by the referring hospital laboratory. The phenotypes of the naive CD4⁺ and CD8⁺ T cells are as described in Table 1. (C,F) The asterisks indicate the values obtained in the referring hospital laboratories. The mean (solid line) and ± 2 SD (dotted lines) for healthy adult data are shown (C) for the referring and transplant center laboratories. (F) The lower limits of the normal PHA response observed in the referring hospital laboratory is indicated by the single dotted line.