Research on murine CD4+ T cells suggests that TGF-β plays a role in determining the fate of these cells, potentially influencing the development of follicular helper T cells (Tfh) and TH17 cells. The relationship between these cell types and their functions is complex, with studies indicating heterogeneity and plasticity among Tfh cells. The underlying mechanisms and implications for immunity and disease are being explored in various contexts, including inflammation and immunotherapy.