A common mutations of DNA involves two adjacent thymines or cytosine, which, in presence of ultraviolet light, may form thymine dimers (damage to the structure of a biological molecule such as DNA formed from thymine via photochemical reactions), causing kinks in the DNA molecule that inhibit normal function.he order that the bases appear is insignificant in the DNA molecule. This means that there can be four different cross rungs â adenine with thymine, thymine with adenine, cytosine with guanine, and guanine with cytosine.
The thymus gland produces T-cells, which fight infection and thus help patients recover from a transplant. T-cells are one of the most important parts of the immune system. They are white blood cells that are responsible for 'coordinating' the body's immune response against viruses, parasites and bacteria. They are essential, said Dr. Daniel Douek, assistant professor of internal medicine at UT Southwestern.
Click to read more below. The thymus gland, despite containing glandular tissue and producing several hormones, is much more closely associated with the immune system than with the endocrine system. The thymus serves a vital role in the training and development of T-lymphocytes or T cells, an extremely important type of white blood cell.