Figure 10. Schematic representation of interactions between the stress and immune system. LC/NE: locus coeruleus/norepinephrine-sympathetic system; SPGN: sympathetic postganglionic neurons; CRH: corticotropin-releasing hormone; AVP: arginine vasopressin; ACTH: adrenocorticotropic hormone (corticotrophin); PAF: platelet activating factor; NE/E: norepinephrine/epinephrine; Th1: T-helper lymphocyte 1; Th2: T-helper lymphocyte 2. Activation is represented by solid green lines and inhibition by dashed red lines.