Where UTF-8 is replaced with the character encoding you want to use and .html is a file extension that this will be applied to. This character encoding will then be set for any file directly in or in the subdirectories of directory you place this file in.
A Barr body is the inactivated X chromosome that is usually found in the nuclei of female somatic cells. It can also occur in males when there is an abnormality and the male is XXY instead of the normal XY, a condition known as Klinefelter's syndrome.
The immune system operates like a sophisticated communications system. When a foreign invader enters the body, the immune system is alerted. At that point, the immune system cells are activated and start to produce powerful chemicals. Immune cells communicate by direct physical contact or they can communicate by releasing chemical messengers.