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megakaryocyte
A megakaryocyte (''mega-'' + ''karyo-'' + ''-cyte'', "large-nucleus cell") is a large bone marrow cell with a lobulated nucleus responsible for the production of blood thrombocytes (platelets), which are necessary for normal blood clotting. Megakaryocytes normally account for 1 out of 10,000 bone marrow cells but can increase in number nearly 10-fold during the course of certain diseases. Owing to variations in combining forms and spelling, synonyms include megalokaryocyte and megacaryocyte.
==Structure==
In general, megakaryocytes are 10 to 15 times larger than a typical red blood cell, averaging 50-100 μm in diameter. During its maturation, the megakaryocyte grows in size and replicates its DNA without cytokinesis in a process called endomitosis. As a result, the nucleus of the megakaryocyte can become very large and lobulated, which, under a light microscope, can give the false impression that there are several nuclei. In some cases, the nucleus may contain up to 64N DNA, or 32 copies of the normal complement of DNA in a human cell.
The cytoplasm, just as the platelets that bud off from it, contains α-granula and Dense bodies.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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