Compared with insulin extracted from cattle or pigs, recombinant human insulin is better because it
- A. works without binding to any receptor
- B. contains DNA as well as protein
- C. has exactly the human amino acid sequence and rarely causes allergic reactions
- D. never needs injection
Explanation
Animal insulins differ slightly in sequence and can provoke immune reactions, while bacterial factories produce authentic human insulin in bulk. It still binds the same receptor and still needs injection.
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