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Category:GO:0031091 ! platelet alpha granule
name: platelet alpha granule
namespace: cellular_component
def: "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)." [PMID:8467233]
synonym: "platelet alpha-granule" EXACT []
xref: Wikipedia:Platelet_alpha-granule
is_a: GO:0030141 ! secretory granule
AmiGO
<GOterm>GO:0031091</GOterm>
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