Extended Data Fig. 1: Histological image of small intestinal mucosa post HSCT.

A) Histological image of small intestinal mucosa with acute graft-versus-host disease on day 44 post HSCT. Note epithelial cell apoptosis (some arrowed) and granulation tissue as a sign of mucosal ulceration (right side). B) Histological image of small intestinal mucosa with normal morphology obtained from terminal ileum 48 months post HSCT. Histology sections from two separate tissue blocks were evaluated at each time point, and the images shown are representative of the evaluated sections.