The Effect of the Human Peptide GHK on Gene Expression Relevant to Nervous System Function and Cognitive Decline Constitutive ghrelin receptor activity enables reversal of dopamine D2 receptor signaling: Molecular Cell GHK Cu may Prevent Oxidative Stress in Skin by Regulating Copper and Modifying Expression of Numerous Antioxidant Genes The Role of G Protein Coupled Receptors (GPCRs) and Calcium Signaling in Schizophrenia. Focus on GPCRs Activated by Neurotransmitters and Chemokines Tolerance and Desensitization Springer Nature Link Succinic acid enhances sedative activity of diazepam through GABAergic receptor modulation: Evidence from behavioral approach and computational insights Naunyn Schmiedeberg's Archives of Pharmacology Springer Nature Link