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    Grimbacher, B., Hutloff, A., Schlesier, M., Glocker, E., Warnatz, K., Dräger, R., Eibel, H. et al., Homozygous loss of ICOS is associated with adult-onset common variable immunodeficiency. Nat. Immunol. 2003. 4: 261268.
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    Tafuri, A., Shahinian, A., Bladt, F., Yoshinaga, S. K., Jordana, M., Wakeham, A., Boucher, L. M. et al., ICOS is essential for effective T-helper-cell responses. Nature 2001. 409: 105109.
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    McAdam, A. J., Greenwald, R. J., Levin, M. A., Chernova, T., Malenkovich, N., Ling, V., Freeman, G. J. and Sharpe, A. H., ICOS is critical for CD40-mediated antibody class switching. Nature 2001. 409: 102105.
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    Coyle, A. J., Lehar, S., Lloyd, C., Tian, J., Delaney, T., Manning, S., Nguyen, T. et al., The CD28-related molecule ICOS is required for effective T cell-dependent immune responses. Immunity 2000. 13: 95105.
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    Hutloff, A., Dittrich, A. M., Beier, K. C., Eljaschewitsch, B., Kraft, R., Anagnostopoulos, I. and Kroczek, R. A., ICOS is an inducible T-cell co-stimulator structurally and functionally related to CD28. Nature 1999. 397: 263266.
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    Chtanova, T., Tangye, S. G., Newton, R., Frank, N., Hodge, M. R., Rolph, M. S. and Mackay, C. R., T follicular helper cells express a distinctive transcriptional profile, reflecting their role as non-Th1/Th2 effector cells that provide help for B cells. J. Immunol. 2004. 173: 6878.
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    Walker, L. S., Gulbranson-Judge, A., Flynn, S., Brocker, T., Raykundalia, C., Goodall, M., Förster, R. et al., Compromised OX40 function in CD28-deficient mice is linked with failure to develop CXC chemokine receptor 5-positive CD4 cells and germinal centers. J. Exp. Med. 1999. 190: 11151122.
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    Allen, C. D., Ansel, K. M., Low, C., Lesley, R., Tamamura, H., Fujii, N. and Cyster, J. G., Germinal center dark and light zone organization is mediated by CXCR4 and CXCR5. Nat. Immunol. 2004. 5: 943952.
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    Mak, T. W., Shahinian, A., Yoshinaga, S. K., Wakeham, A., Boucher, L. M., Pintilie, M., Duncan, G. et al., Costimulation through the inducible costimulator ligand is essential for both T helper and B cell functions in T cell-dependent B cell responses. Nat. Immunol. 2003. 4: 765772.
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    Riley, J. L., Blair, P. J., Musser, J. T., Abe, R., Tezuka, K., Tsuji, T. and June, C. H., ICOS costimulation requires IL-2 and can be prevented by CTLA-4 engagement. J. Immunol. 2001. 166: 49434948.
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    van Berkel, M. E. A. T., Schrijver, E. H. R., Hofhuis, F. M. A., Sharpe, A. H., Coyle, A. J., Broeren, C. P., Tesselaar, K. and Oosterwegel, M. A., ICOS contributes to T cell expansion in CTLA-4 deficient mice. J. Immunol. 2005. 175: 182188.
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    Bennett, F., Luxenberg, D., Ling, V., Wang, I.-M., Marquette, K., Lowe, D., Khan, N. et al., Program death-1 engagement upon TCR activation has distinct effects on costimulation and cytokine-driven proliferation: Attenuation of ICOS, IL-4, and IL-21, but not CD28, IL-7, and IL-15 responses. J. Immunol. 2003. 170: 711718.
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    Leonard, W. J. and Spolski, R., Interleukin-21: A modulator of lymphoid proliferation, apoptosis and differentiation. Nat. Rev. Immunol. 2005. 5: 688698.
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    Akiba, H., Takeda, K., Kojima, Y., Usui, Y., Harada, N., Yamazaki, T., Ma, J. et al., The Role of ICOS in the CXCR5+ follicular B helper T cell maintenance in vivo. J. Immunol. 2005. 175: 23402348.
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    Bonhagen, K., Liesenfeld, O., Stadecker, M. J., Hutloff, A., Erb, K., Coyle, A. J., Lipp, M. et al., ICOS+ Th cells produce distinct cytokines in different mucosal immune responses. Eur. J. Immunol. 2003. 33: 392401.
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    Rottman, J. B., Smith, T., Tonra, J. R., Ganley, K., Bloom, T., Silva, R., Pierce, B. et al., The costimulatory molecule ICOS plays an important role in the immunopathogenesis of EAE. Nat. Immunol. 2001. 2: 605611.