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* ''Organelle zone'' contains organelles such as mitochondria along with three different granule types
* ''Organelle zone'' contains organelles such as mitochondria along with three different granule types
* ''Membrane zone'' is made of two types of membrane. One, the open canicular system, is membrane not used when the platelet budded off the megakaryocyte. The other, the dense tubular system, is membrane from the rough endoplasmic reticulum and is involved in calcium ion storage and regulation.
* ''Membrane zone'' is made of two types of membrane. One, the open canicular system, is membrane not used when the platelet budded off the megakaryocyte. The other, the dense tubular system, is membrane from the rough endoplasmic reticulum and is involved in calcium ion storage and regulation.
<p>See reptile [[Thrombocytes - Reptile|thrombocytes]]</P>
==Granules==
==Granules==
*α granules are the most common and contain coagulation factors, fibrinogen, plasminogen, plasminogen activator factor and platelet derived growth factor (PDGF)
*α granules are the most common and contain coagulation factors, fibrinogen, plasminogen, plasminogen activator factor and platelet derived growth factor (PDGF)