In the standard genetic code (Table 4.1, shown below) , a nucleotide in a codon is said to be a fourfold degenerate site if its mutation to any other nucleotide results in a synonymous mutation. How many codons in the standard genetic code have a fourfold degenerate site? 
A) 4
B) 8
C) 12
D) 16
E) 20
Correct Answer:
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