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Molecular function
GO:0005097, GO:0005098, GO:0005099, GO:0005100, GO:0005101, GO:0008060, GO:0017123, GO:0030675, GO:0046582
GAP activity
Binds to and increases the activity of a GTPase, an enzyme that catalyzes the hydrolysis of GTP.
Note that the name Sar derives from 'secretion-associated, Ras-related'.