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Proliferating cells in the mediastinal fat‐associated lymphoid clusters (MFALCs) of the mice. Immunohistochemistry for bromodeoxyuridine (BrdU) in MRL/MpJ (a), MRL/MpJ‐lpr (b), BXSB/MpJ (c), and BXSB/MpJ‐Yaa (d) mice. Fewer BrdU‐positive cells are visible within the MFALCs of MRL/MpJ and BXSB/MpJ mice (a, c) than in the MFALCs of MRL/MpJ‐lpr and BXSB/MpJ‐Yaa mice (b, d) at 4 months.
