How Letrozole Is Given: 1  Letrozole is a pill, taken by mouth. 2  You should take Letrozole at about the same time each day. You may take Letrozole with or without food. If you miss a dose, do not take a double dose the next day. 3  You should not stop taking Letrozole without discussing with your physician.
Comparative genomics studies of mammalian genomes suggest that approximately 5% of the human genome has been conserved by evolution since the divergence of extant lineages approximately 200 million years ago, containing the vast majority of genes.
DNA also contains all the genetic coding which is used to control functions, behavior and development of an organism. DNA is also used as a long term storage device to store the genetic instructions. These instructions must be correct so the DNA can make an exact copy of itself. The function of DNA in a cell is to code the way proteins turn genes on or off. the function of DNA is to make the proteins. DNA is the foundation of life.