What do Rab proteins (a family of GTPases) do to assist in the process of exocytosis?
A) Rab proteins are calcium sensors for exocytosis.
B) Rab proteins prepare syntaxin for participation in the SNARE protein four-helix bundle.
C) Rab proteins stabilize the SNARE complex to prevent fusion until calcium ions enter the nerve terminal.
D) Rab proteins target synaptic vesicles to appropriate membrane sites for subsequent docking.
E) Rab proteins are involve in recovering synaptic vesicle membrane after exocytosis.
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