NRGN and Alzheimer disease: We found that Nrgn KO mice exhibited a clear decrease in nesting behavior compared with that in wild‐type mice (Figure 1A; male, P < 0.0001; female, P = 0.0006), which may be analogous to the impaired executive function22, 23 seen in patients with schizophrenia,24, 25 ADHD,26, 27 and AD.28