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| Thymidine (first row) can be |
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| produced by deamination of |
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| 5-methyl cytosine, |
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| converting
C to T, |
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| particularly at CpG |
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| dinucleotides. Deamination |
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| of cytosine produces uracil |
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| which is usually removed |
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| and replaced by cytosine, so |
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| T -> C is less common. |
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