A protein molecule, embedded in either the plasma membrane or cytoplasm of a cell, to which a mobile signaling (or "signal") molecule may attach.
A structure that recognizes a stimulus in the internal or external environment of an organism.
an organ that responds to stimulation
an organ having nerve endings (in the skin or viscera or eye or ear or nose or mouth) that respond to stimulation
a cellular structure that is postulated to exist in order to mediate between a chemical agent that acts on nervous tissue and the physiological response
