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Affinity-mature B cells require cognate antigen, retained by follicular dendritic cells (FDCs), for clonal selection within germinal centers. Studies on how FDCs in lymphoid tissues acquire antigen have relied primarily on model protein antigens. To examine delivery of intact bacteria to FDCs, we used inactivated Streptococcus pneumonia (SP). We found that both medullary macrophages and a subset of...
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