Human genetic studies have identified associations between variations in PPP3CC, the gene that encodes the α-1 subunit of calcineurin A, and schizophrenia, in both Caucasian (Gerber et al., 2003) and Asian populations (Horiuchi et al., 2007; Liu et al., 2007; Yamada et al., 2007). Here, PPP3CC is linked to schizophrenia.