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A germinal center in a lymph follicle in the jejunum (400X)

Microimage
A germinal center in a lymph follicle in the jejunum. Image copyright: University of Oslo, CC BY-NC-ND 4.0. (Tissue stain: H+E).

A germinal center is an area in a lymph follicle / lymphoid follicle where an active B-cell immune response takes place. B cells produce antibodies.