PRDX2 and graft versus host disease: We investigated the proteins of erythrocytes from stem cell transplantation patients and found decreased expression of band3 and C‐terminal‐truncated peroxiredoxin 2 (PRDX2) only during severe graft‐versus‐host disease (GVHD), using time‐of‐flight mass spectrometry (TOF‐MS) analysis and Western blotting.