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©2013 UpToDate ® Print Email Urinary monoclonal protein Panel B: This figure illustrates the cellulose acetate electrophoretic pattern of a urine sample. It reveals a dense band of protein with beta mobility. Panel A: Densitometer tracing shows a tall, narrow-based peak of beta mobility. These findings are consistent with a urine monoclonal protein (Bence Jones protein); confirmation of the diagnosis requires demonstration that the protein contains only a lambda or kappa light chain with no heavy chain reactivity.