The importance of stable free radicals in the mechanism of E.coli ribonucleotide reductase was identified in the early 1970s.The existence of stable radicals in a protein had not been previously observed.Which of the following amino acids can exist as a stable radical in ribonucleotide reductase?
A) Cys
B) His
C) Ser
D) Glu
Correct Answer:
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