Figure 4 Proinflammatory immune cells and their crosstalk in patients with IBD Figure 4 | Proinflammatory immune cells and their crosstalk in patients with IBD. Although IL-12-driven type 1 T helper (TH1) cells and IL-23-activated type 17 T helper (TH17) cells were detected in Crohn's disease, type 2 T helper (TH2), type 9 T helper (TH9) and TH17 cells were identified in ulcerative colitis. The key transcription factors for each T-cell subset as well as the subset associated signature cytokines are indicated. NK cell, natural killer cell; Treg cell, regulatory T cell. Neurath, M. F. (2016) Current and emerging therapeutic targets for IBD Nat. Rev. Gastroenterol. Hepatol. doi:10.1038/nrgastro.2016.208