Answer :
Final answer:
The protein GEF-H₁ is best classified as an enzyme due to its role in controlling immune responses to viruses.
Explanation:
In the context of controlling immune responses to viruses, the protein GEF-H₁ would be best classified as an enzyme. Enzymes play a crucial role in various cellular functions by catalyzing specific reactions, which aligns with the function of GEF-H₁ in controlling immune responses.
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