NCIt definition : Signal induction is the intercellular or intracellular transfer of information (biological
activation/inhibition) through a signal pathway. In each signal transduction system,
an activation/inhibition signal from a biologically active molecule (e.g., hormone,
neurotransmitter, etc.) is transferred to a receptor molecule through a physical binding
interaction that alters the conformational and functional state of the receptor molecule
and promotes an alteration in cell function.;