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June 08, 2017; 129 (23)

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Representative immunofluorescence staining of a splenic germinal center (peanut agglutinin, red) with follicular helper T cells (CD4, green) and follicular regulatory T cells (Foxp3, white). The density of follicular regulatory T cells increases after infusion of invariant natural killer T cells. See the article by Du et al on page 3121.