Subjects: outpatients with BPD (n = 26, 24 female) and HC (n = 11, all female). Diagnostics: DSM-IV. Methods: DNA bisulfite treatment, PCR amplification for selective methylation analysis: bisulfite pyrosequencing of HTR2A, NR3C1, MAOA, MAOB and COMT promoter regions (27CpG sites), performed in triplicates and averaged. Here, MAOB is linked to Borderline personality disorder.