Plasma cell cancer. Coloured transmission electron micrograph (TEM) of malignant (cancerous) cells in a plasmacytoma, a tumour of plasma cells. The la


Plasma cell cancer. Coloured transmission electron micrograph (TEM) of malignant (cancerous) cells in a plasmacytoma, a tumour of plasma cells. The large, irregular nuclei (dark blue) in these cells indicate they are actively dividing. The cell at centre is undergoing mitosis (nuclear division). Its nuclear membrane has disappeared and the chromosomes (very dark blue) are about to divide into two identical sets. Mitosis is a prelude to cell division. The cell at bottom left has a prominent nucleolus (round, in nucleus), characteristic of active cells. Plasma cells are a type of white blood cell found in bone marrow. Magnification: x3160 when printed at 10 centimetres wide.


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