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In the formation of a COPI-coated vesicle…

Group of answer choices

Sar1-GEF causes SAR1 to release GDP and bind to GTP.

Dynamin assembles into a ring and helps pinch off clathrin-coated vesicles. ARF-GEF causes ARF to release GDP and bind to GTP.

GDP-bound Sar1 binds two COPI proteins to cause initial membrane curvature.