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    Breitfeld, D., Ohl, L., Kremmer, E., Ellwart, J., Sallusto, F., Lipp, M., and Forster, R., Follicular B helper T cells express CXC chemokine receptor 5, localize to B cell follicles, and support immunoglobulin production. J. Exp. Med. 2000. 192: 15451552.
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    Schaerli, P., Willimann, K., Lang, A. B., Lipp, M., Loetscher, P., and Moser, B., CXC chemokine receptor 5 expression defines follicular homing T cells with B cell helper function. J. Exp. Med. 2000. 192: 15531562.
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    Schaerli, P., Loetscher, P., and Moser, B., Cutting edge: induction of follicular homing precedes effector Th cell development. J. Immunol. 2001. 167: 60826086.
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    Kim, C. H., Rott, L. S., Clark-Lewis, I., Campbell, D. J., Wu, L., and Butcher, E. C., Subspecialization of CXCR5+ T cells: B helper activity is focused in a germinal center-localized subset of CXCR5+ T cells. J Exp. Med. 2001. 193: 13731381.
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    Casamayor-Palleja, M., Khan, M., and MacLennan, I. C., A subset of CD4+ memory T cells contains preformed CD40 ligand that is rapidly but transiently expressed on their surface after activation through the T cell receptor complex. J. Exp. Med. 1995. 181: 12931301.
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    Lim, H. W., Hillsamer, P., and Kim, C. H., Regulatory T cells can migrate to follicles upon T cell activation and suppress GC-Th cells and GC-Th cell-driven B cell responses. J Clin. Invest 2004. 114: 16401649.
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    Johansson-Lindbom, B., Ingvarsson, S., and Borrebaeck, C. A., Germinal centers regulate human Th2 development. J. Immunol. 2003. 171: 16571666.
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    Rasheed, A-U., Rahn, H-P., Sallusto, F., Muller, G. and Lipp, M., Follicular B helper T cell activity is confined to CXCR5hi ICOShi CD4 T cell s and independent of CD57 expression. Eur. J. Immunol. 2006. 36: DOI 10. 1002/eji. 200636136
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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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    Kim, C. H., Lim, H. W., Kim, J. R., Rott, L., Hillsamer, P., and Butcher, E. C., Unique gene expression program of human germinal center T helper cells. Blood 2004. 104: 19521960.
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    Sharpe, A. H. and Freeman, G. J., The B7-CD28 superfamily. Nat. Rev. Immunol. 2002. 2: 116126.
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    Riley, J. L., Mao, M., Kobayashi, S., Biery, M., Burchard, J., Cavet, G., Gregson, B. P. et al., Modulation of TCR-induced transcriptional profiles by ligation of CD28, ICOS, and CTLA-4 receptors. Proc. Natl. Acad. Sci. U. S. A 2002. 99: 1179011795.
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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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    Dong, C., Juedes, A. E., Temann, U. A., Shresta, S., Allison, J. P., Ruddle, N. H., and Flavell, R. A., ICOS co-stimulatory receptor is essential for T-cell activation and function. Nature 2001. 409: 97101.
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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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    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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    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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    Walker, L. S., Gulbranson-Judge, A., Flynn, S., Brocker, T., Raykundalia, C., Goodall, M., Forster, 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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    Grimbacher, B., Hutloff, A., Schlesier, M., Glocker, E., Warnatz, K., Drager, 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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    Warnatz, K., Bossaller, L., Salzer, U., Skrabl-Baumgartner, A., Schwinger, W., van der, B. M., van Dongen, J. J. et al., Human ICOS-deficiency abrogates the germinal center reaction and provides a monogenic model for common variable immunodeficiency. Blood 2006. 107: 30453052
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    Vinuesa, C. G., Cook, M. C., Angelucci, C., Athanasopoulos, V., Rui, L., Hill, K. M., Yu, D. et al., A RING-type ubiquitin ligase family member required to repress follicular helper T cells and autoimmunity. Nature 2005. 435: 452458.