title: The sociobiological paradigm: a new approach to drug using behavior.
mesh_terms: D005075:Biological Evolution; D004723:Endorphins / Q000502:physiology; D014644:Genetic Variation; D005824:Genetics, Behavioral; D006801:Humans; D010641:Phenotype; D012919:Social Behavior; D019966:Substance-Related Disorders / Q000235:genetics*
chemical_list: D004723:Endorphins