The blueprint for stress can be found in invertebrates. Stefano G, Cadet P, Zhu W, Rialas C, Mantione K, Benz D, Fuentes R, Casares F, Fricchione G, Fulop Z, Slingsby B. Journal Article 2002; 23(2): 85-93 PubMed PMID: 12011791 Keywords: Adrenocorticotropic Hormone:physiology, Animals, Biological Evolution, Invertebrates:physiology, Opioid Peptides:physiology, Stress, Physiological:physiopathology,. Citation : Through an extremely complicated equilibrium called homeostasis, all living organisms maintain their survival in the face of both extern..... Read abstract