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Flow cytometric analysis of B cells in vitreous specimens. (A, B) primary vitreoretinal lymphoma; all CD19+ B cells (marked in red) show monotypic surface membrane immunoglobulin lambda (SmIgλ) expression; (C, D) Multiple sclerosis‐related uveitis; all CD19+ B cells (marked in red) show monotypic SmIgλ expression; (E, F) Uveitis in the context of sarcoidosis; CD19+ B cells either show SmIgκ (blue) or SmIgλ (purple) expression.
