We now know that the main purpose of genes is to store the recipe for making proteins. It is proteins that do almost every chemical, structural and regulatory thing that is done in the body: they generate energy, fight infection, digest food, form hair, carry oxygen and so on and on. Every single protein in the body is made from a gene by a translation of the genetic code. The same is not quite true in reverse: there are genes, which are never translated into protein,
