My understanding is that genes code for proteins that then do a certain function. Apart from mitosis in an organism, I heard that cells (in forms of stem cells) are also produced and released into the body. I guess these would be all the floating around the body cells? Or the nerve cells that are sent off to climb up the spine to find its place? My question is, do genes "indirectly" code for cells by creating proteins that will then build a new cell, or stimulate a cell to divide itself? And if yes, is there classification for groups of genes that for example, code for the red blood cell, or for a muscle cell?