Which of the following is NOT a possible restriction enzyme recognition site?
A: 5'GAAATTTC-3'
B: 5'ACGTACGT-3'
C: 5'AATTTTAA-3'
D: 5'AAAATTTT-3'
E: All of the above are possible recognition sites.
Ans: C: 5'AATTTTAA-3'
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