M: males; f: female; OT: oxytocin; HC: healthy controls; BPD: borderline personality disorder; SCID-I: Structured Clinical Interview for Diagnostic and Statistical Manual-Fourth Edition Axis I Disorders; SCID-II: Structured Clinical Interview for Diagnostic and Statistical Manual-Fourth Edition Axis II Disorders; IPDE: International Personality Disorder Examination; SSRI: selective serotonin reuptake inhibitor; ECG: electrocardiogram; DSM IV: The Diagnostic and Statistical Manual of Mental Disorders-Fourth Edition. The gene discussed is OXT; the disease is personality disorder.