A DNA puzzle

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Sandra Porter

Okay, all of you biochemists and molecular biology types. I have a puzzle for you that I found by accident during a lecture. Yes, I was the one lecturing and the notes will be posted soon.

In the meantime, here's your puzzle: What's unusual about this pair of bases?



(Those of you who attended our Chautauqua course - I know you probably know the answer - but don't answer, okay?)