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I'm not quite sure what you mean by this, but the letters of DNA are A (Adenine), T (Thymine), C (Cytostine), and G (guanine). You may be thinking of how T is replaced by U (Uracell) in RNA code.

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11y ago
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Wiki User

11y ago

A T C G

(Adenine, thymine, cytosine, guanine)

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Lathen Silva

Lvl 7
4y ago

S is a letter that is not in the gentic code of DNA

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Wiki User

12y ago

"U" for uracil; found only in RNA.

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Wiki User

9y ago

S

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Wiki User

13y ago

letter a

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Q: What letter does NOT represent one of the possible bases in the DNA structure?
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