title: PHOTO-NEURO-ENDOCRINE SYSTEMS: GENERAL CONCEPTS.
mesh_terms: D002940:Circadian Rhythm; D004703:Endocrine System; D008027:Light; D009482:Neurophysiology; D009489:Neurosecretion; D009900:Optic Nerve; D010507:Periodicity; D012106:Research; D012160:Retina
keywords: CIRCADIAN RHYTHM; EXPERIMENTAL LAB STUDY; LIGHT; NEUROPHYSIOLOGY; NEUROSECRETION; OPTIC NERVE; PERIODICITY; RETINA