Preface -- A Historic Review of the D3 Dopamine System from D3 Cloning to Clinical Trials in Schizophrenia and Drug Addiction -- Location, Location, Location: The Expression of D3 Dopamine Receptors in the Nervous System -- Recent Advances in Dopamine D3 Receptor Heterodimers: Focus on Dopamine D3 and D1 Receptor-Receptor Interaction and Striatal Function -- Involvement of DA D3 Receptor and Mitochondrial Functions in Structural Neuroplasticity of the Emotional Brain Circuits: Possible Role in Depression -- Dopamine D3 Receptor in Parkinson Disease: A Prognosis Biomarker and an Intervention Target -- Dopamine D3 Receptors: A Potential Target to Treat Motivational Deficits in Parkinson's Disease -- Therapeutic Challenges of Cognitive Dysfunctions in Neuropsychiatric Disorders: Focus on the Dopamine D3 Receptor -- Dopamine D3 Receptor in Stimulant and Opiate Use Disorders -- The Role of D3 Dopamine-Receptors in Nicotine Dependence: A Synthesis of the Pre-Clinical and ClinicalLiterature -- The Dopamine D3 receptor in Food Addiction -- The Dopamine D3 Receptor Pharmacology and the Therapeutic Use of D3 Receptor Ligands in Schizophrenia -- D3 receptors and Restless Legs Syndrome -- D3 receptors and PET imaging.