SECCHI-LECAQUE / ROUSSEL-UCLAF / CNRI / SCIENCE PHOTO LIBRARY SECCHI-LECAQUE / ROUSSEL-UCLAF / CNRI / SCIENCE PHOTO LIBRARY
Bone marrow with megakaryocyte. Light micrograph of a section through a sample of bone marrow, showing a megakaryocyte (large, centre). Megakaryocytes are the bone marrow cells responsible for the production of blood platelets (thrombocytes). Bone marrow contains blood stem cells, used to provide a constant supply of new blood cells throughout a person's lifetime. Magnification: x500 when printed 10 centimetres wide.
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