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IgG-secreting cells in murine BALT. Lungs from mice infected with influenza 10 days previously were frozen in OCT medium and sectioned on a cryostat. Sections were probed with antibodies to B220 (white), IgG (green), and CD3 (red) and were counterstained with DAPI (blue). Note that the architecture is not well developed and the B220+ B cells, CD3+ T cells, and IgG+ plasma cells are intermixed.
