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Phosphate Groups Phosphorus Attached to Four Oxygen Question

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A scientist is trying to separate nuclear import receptors from their cargo proteins. The scientist has a tube containing nuclear receptors bound to cargo proteins and Ran-GDP. What should the scientist add?

Group of answer choices

Ran-GEF only.

GTP only.

Ran-GEF and GTP.

Ran-GEF, GTP, and phosphate groups.