CSP (25 mg/kg) was administered on days 0–13 after allo-HCT. (A, B, E, and F) scRNA-seq. (C and D) CD62L on 2C-Tg donor T cells (n = 5/group). Box-and-whisker plot shows the median (vehicle vs. CSP: 2.510 vs. 0.990; line in box), IQR (0.57–3.12 vs. 0.86–2.39; box bounds), and minimum/maximum values (0.43/3.47 vs. 0.61/3.41; whiskers). P > 0.99 by 2-tailed Mann-Whitney U test (D).