has subject area Animals Antidepressive Agents Behavior, Animal Depression Disease Models, Animal Freund's Adjuvant Hippocampus Hyperalgesia Indoleamine-Pyrrole 2,3,-Dioxygenase Inflammation Interleukin-1beta Interleukin-6 Ketamine Kynurenine Male Nociception Rats Rats, Sprague-Dawley Serotonin Tryptophan