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A. Serum immunofixation electrophoresis. It shows biclonal gammophthy of IgG lambda and IgA lambda type. B. Photomicrographs of bone marrow aspirate at diagnosis showing infiltration by malignant plasma cells, and absent erythropoiesis (H&E, 40× and 100×). C. Photomicrographs of bone marrow aspirate after treatment with bortezomib (H&E, 40× and 100×). There is an almost complete absence of red-cell precursors.
