21. Which of the following is the mechanism of action of 5-fluorouracil?
(A) competitive inhibitor of dihydrofolate reductase,
(B) non-competitive inhibitor of thioredoxin reductase,
(C) competitive inhibitor of ribonucleotide reductase,
(D) suicide substrate for thymidylate synthase,
(E) none of the above.
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Which of the followi...
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（D）為正解 正確答案是 (D) 胸苷...
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