secretory granule
A small subcellular vesicle, surrounded by a membrane, that is formed from the Golgi apparatus and contains a highly concentrated protein destined for secretion. Secretory granules move towards the periphery of the cell and upon stimulation, their membranes fuse with the cell membrane, and their protein load is exteriorized. Processing of the contained protein may take place in secretory granules.
GO:0099503
secretory vesicle
is_a
GO:0012505
endomembrane system
part_of
secretory vesicle
broad