CHMP7 and attention deficit-hyperactivity disorder: Given the consistently reported reduced brain volumes for individuals with ADHD, the heads of chmp7+/+ (n = 12) and chmp7+/− (n = 12) zebrafish on a pan-neuronal fluorescent Tg(HuC:eGFP) background, were imaged live using confocal microscopy at 6 dpf (Fig. 4A).