title: The biology of depression: conceptual issues.
mesh_terms: D000928:Antidepressive Agents / Q000494:pharmacology; D001831:Body Temperature; D003866:Depressive Disorder / Q000503:physiopathology*; D003907:Dexamethasone; D006801:Humans; D006854:Hydrocortisone / Q000378:metabolism; D006897:Hydroxyindoleacetic Acid / Q000032:analysis; D008137:Longitudinal Studies; D008950:MMPI; D008734:Methoxyhydroxyphenylglycol / Q000032:analysis; D018377:Neurotransmitter Agents / Q000502:physiology; D010507:Periodicity; D012895:Sleep, REM / Q000502:physiology
chemical_list: D000928:Antidepressive Agents; D018377:Neurotransmitter Agents; D008734:Methoxyhydroxyphenylglycol; D006897:Hydroxyindoleacetic Acid; D003907:Dexamethasone; D006854:Hydrocortisone