On day 35, the CP of ADHD-derived organoids contained significantly more cells expressing CTIP2 and cells coexpressing TBR1 and CTIP2 than that of control-derived organoids (CTIP2: p < 0.05; coexpression of TBR1 and CTIP2: p < 0.05, Fig. 2b), even though their thickness was thinner than that of control-derived organoids. This evidence concerns the gene TBR1 and attention deficit-hyperactivity disorder.