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In DNA, there are 4 different kinds of nucleotides. A, T, C and G

In RNA, there are also 4, but T has been replaced by U. (I think. It's been awhile)

So there are 81 combos that you might see in real life, but there are 243 that you could prepare in a lab.

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13y ago
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Q: How many three letter combination of nucleotides are there?
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