...Surprisingly,1
Or perhaps not.
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... it,2
By definition. It's new.
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... nucleotides.3
Why three when there are four nucleotides? Because if the nucleotide at a certain position is an A, for example, it can only change to a C, G, or T.
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... extensively4
That mean's they've made it more complicated.
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... understand.5
It's the concepts that get tricky, not the algebra.
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