Review important concepts of receptor theory.
D000818:Animals; D001671:Biochemistry / Q000266:history; D001696:Biomechanical Phenomena; D049672:History, 19th Century; D049673:History, 20th Century; D006801:Humans; D009448:Neurochemistry / Q000266:history; D011955:Receptors, Drug / Q000502:physiology*
D011955:Receptors, Drug