In particular, MAOB allelic variations have been associated with bipolar disorder (Lin et al., 2000) and higher schizophrenia susceptibility (Hovatta et al., 1999; Gasso et al., 2008; Carrera et al., 2009; Piton et al., 2011); these results, however, have been not been consistently replicated (Coron et al., 1996; Sobell et al., 1997; Matsumoto et al., 2004; Bergen et al., 2009). Here, MAOB is linked to schizophrenia.