This is a fundamental precept of criminal law, even if it is not a particularly well-understood concept among the general public. One of the Attorney General's responsibilities in fostering public respect for the rule of law, is to assist the public in understanding the nature and limits of the prosecutorial function.
Signal transduction: A basic process in molecular cell biology involving the conversion of a signal from outside the cell to a functional change within the cell. signal (such as a hormone or neurotransmitter) interacts with a receptor on the cell surface; this interaction causes a change in a second messenger (such calcium); and, eventually, a change is triggered in the cell's function (for example, the cell divides).
signal transduction proteins. proteins which may be a protein kinase, an ion channel forming protein (as in nerve cells), or a protein that undergoes some energy dependent change in which the energy is supplied by the hydrolysis of a higher energy compound such as guanosine triphosphate.