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Figure 5: Lymph node biopsy reveals disorganization with myeloid and erythroid precursors among the fat. Several cells show karyokinesis (H&E staining 400x). On November 21, 2009, a lymph node biopsy was performed. The left upper arrow showed karyokinesis, the left lower arrow indicated widespread fat cells, the right upper arrow demonstrated erythroblasts, and the right lower arrow suggested myeloblast.