DNA, which carries the instruction manuals for all the proteins of the cell, but not just blueprints but also their production cycles. These proteins determine the development, function, growth, behavior, and reproduction of your cell. So whoever controls the protein production controls the cell itself. How does this work? Well, your DNA consists of smaller sections, your genes, and each gene is the instruction for one protein. To turn the instructions from a gene into an actual protein, this information needs to be transmitted to the protein production machinery in the cell.
