CD38 and autism spectrum disorder: Consistent with these findings, in humans peripheral CD38 gene expression was positively correlated with oxytocin levels (Kiss et al., 2011), and a common variant of a SNP involving a cytosine (C) to adenine (A) switch on the CD38 gene, rs3796863, was related to autism spectrum disorder (ASD), which involves deficits in social processing (Lerer et al., 2010; Munesue et al., 2010).