GO_term: GO:0031091   

GO:0031091	Definition	A secretory organelle found in blood platelets, which is unique in that it exhibits further compartmentalization and acquires its protein content via two distinct mechanisms: (1) biosynthesis predominantly at the megakaryocyte (MK) level (with some vestigial platelet synthesis) (e.g. platelet factor 4) and (2) endocytosis and pinocytosis at both the MK and circulating platelet levels (e.g. fibrinogen (Fg) and IgG).
	Term	platelet alpha granule
	Type	Cellular_component
	Child	Component	GO:0031092
			GO:0031093
	Parent	Instance_of	GO:0030141
	Attributes_of	Index	Ancestor (19)
			Descendent	GO:0031092
				GO:0031091
				GO:0031093

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