So they can enter other organ nouns such as the nucleus or the mitochondria or so forth. So secondary messengers are free to move or diffuse around the cell. This means that they can go on and influence processes within different compartments of that cell. So once again, we can have two of the same secondary messengers go on to different places in that cell and basically influence different processes and that could amplify the effects of that signal. Let's move on to four activation or in some cases inhibition of effectors. So what exactly is an effector?