GADD45B and colitis: We further investigated the precise roles of hematopoietic and epithelial cells in Gadd45β-KO mice with exacerbated experimental colitis via bone marrow cell transplantation, revealing that Gadd45β-WT mice transplanted with bone marrow from WT or Gadd45β-KO animals exhibited similar colitis severity, which was evident through microscopic and histological analyses.