A follicular dendritic cell retains antigen in a germinal center. What is its major role?

A patient has defective mucus production in the gut. Which epithelial cell type is most affected?

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A thymocyte successfully expresses a pre-TCR. What immediate result follows?

A patient lacks effective secretory IgA. Which consequence is most likely?

A researcher blocks GATA-3 activation in early thymic progenitors. Which process is most impaired?

A patient with intracellular bacterial infection requires macrophage activation. Which helper T-cell subset is most important?

A 6-month-old infant has chronic diarrhea, oral candidiasis, recurrent viral infections, and failure to thrive. Laboratory evaluation demonstrates markedly decreased T cells, B cells, and NK cells due to accumulation of toxic purine metabolites. Which enzyme deficiency is most likely responsible?

A newborn has severe recurrent viral and fungal infections. Flow cytometry shows markedly reduced mature CD4+ and CD8+ T cells. A thymic defect prevents early progenitors from committing to the T-cell lineage. Which signaling pathway is most directly affected?

A naïve T cell receives signal 1 and signal 2. Local cytokines then determine its fate. What is the role of these cytokines?