FKBP4 and nervous system disorder: Nonetheless, other PPIases such as members of FKBP family may be responsible, and in particular those that are already linked to neurological diseases, for example FKBP12, FKBP51, or FKBP52(Sugata et al., 2009, et al., 2011; Blair et al., 2013; Manabe et al., 2002).