NPAS3 protein expression in the dorsolateral prefrontal cortex across development. (A) Representative Western blots of the developmental cohort probed with an antibody to the NPAS3 protein (Abcam; Cat#ab59190), which can detect the predicted 100 kDa protein as well as a developmental age-specific protein migrating at 90 kDa. This 90 kDa NPAS3 immunoreactive protein was only observed in infant and toddler cases. β-actin was probed as a loading control and an internal control was used for normalization between Western blots. IC = internal control, N = neonate, I = infant, Tod = toddler, SA = school age, Teen = teenage, YA = young adult, A = adult. (B) The 100-kDa NPAS3 protein and β-actin were quantified by densitometry. NPAS3 expression was normalized to β-actin and presented as mean + SEM. *P < .05, **P < .01, ***P < .005. † 90 kDa NPAS3 immunoreactive protein band.