Unknown quotes. There comes a time in life when you have to let go of all the pointless drama and the people who create it. 6 up, 2 down. favorite. Paul McCartney quotes. I think people who create and write, it actually does flow-just flows from into their head, into their hand, and they write it down.
A major type of UV light induced damage is the formation of cyclobutane pyrimidine dimers (PyrîîPyr) between adjacent pyrimidine bases in DNA exposed to UV radiation in the range of 200â300 nm (far-UV) [1] and [2] .
Accidental deamination may change the cytosine to uracil, or the methylated cytosine to thymine. Cytosine is one of four bases in DNA molecules. As shown in the above figure, it may be mutated to uracil by deamination. Since uracil is not part of DNA, this mutation can easily be detected and repaired by base excision. Suppose DNA, like RNA, were made up of uracil, then the cytosine to uracil mutation could be corrected only by mismatch repair which is very inefficient.