Bone marrow blood cells. Light micrograph of blood cells forming in bone marrow. White blood cells are large and purple with complex, shaped nuclei. Red blood cells are pale red. Platelets (not many seen) are small purple granules. Blood cells are produced constantly by the bone marrow as their lifespan is very short. Red blood cells, platelets and three types of white blood cell: granulocytes, lymphocytes and monocytes, are all derived from a single ancestral cell known as the multipotential stem cell. Magnification: x1150 when printed 10cm wide.
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