- Stat5 is required for IL-2-induced cell cycle progression of peripheral T cells. Moriggl, R., Topham, D.J., Teglund, S., Sexl, V., McKay, C., Wang, D., Hoffmeyer, A., van Deursen, J., Sangster, M.Y., Bunting, K.D., Grosveld, G.C., Ihle, J.N. Immunity (1999)