The TGF-β-Smad3 pathway inhibits CD28-dependent cell growth and proliferation of CD4 T cells. - Delisle, J-S; Giroux, M; Boucher, G; Landry, J-R; Hardy, M-P; Lemieux, S; Jones, R G; Wilhelm, B T; Perreault, C (Genes & Immunity, 2013)