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A. Jeurissen, A. D. Billiau, L. Moens, L. Shengqiao, W. Landuyt, G. Wuyts, L. Boon, M. Waer, J. L. Ceuppens, X. Bossuyt. "CD4+ T Lymphocytes Expressing CD40 Ligand Help the IgM Antibody Response to Soluble Pneumococcal Polysaccharides via an Intermediate Cell Type." Journal of Immunology 176.1 (2005) 529-536