Extended Data Fig. 3: Detection of PC13 CAR T cells in colonic biopsies of patients with immune-mediated colitis.

a, Representative IHC images of colonic biopsy tissues from the I.P. group, stained for CD3 and the PC13 CAR (40× magnification). qPCR analysis of CAR transgene copy numbers in colitis biopsy samples and paired peripheral blood from (b) Patient 028 and (c) Patient 029. Due to the limited size of each clinical biopsy, IHC was performed once per patient. Abbreviations: IHC, immunohistochemistry; I.P., intraperitoneal infusion; qPCR, quantitative real-time polymerase chain reaction.