Changes in CD127 expression on T cells after rhIL-7 administration. CD127-expressing CD4⁺ and CD8⁺ T cells decreased after rhIL-7 administration and re-emerged by day 4 among CD4⁺ T cells or day 14 among CD8⁺ T cells. P values represent comparisons between rhIL-7 and placebo recipients by Wilcoxon rank sum test. ● represents placebo participants () and ▲ represents rhIL-7 participants ().