The end product observed when a specific sequence of DNA or RNA is detected by autoradiography or by some other method. Hybridization with complimentary radioactive polynucleotide (e.g., by southern or northern blotting) is commonly used to generate the signal. This term also applies to the transmission of intracellular reactions as in signal transduction or signal transmission that occurs when a hormone is bound to its cognate receptor on the exterior surface of the cell.
Any form of communication that provides information. It is usually oral, written, visual, or electronic (i.e., transmitted by radio, telephone, television, laser, or optical fibers).
Commonly denoting an electrical flow that fluctuates at a given frequency, it serves the purpose of modulating another process or undergoes conversion via a transducer into a discernible form of energy that can be perceived by human faculties.